PyQT5 not responding, how to fix?

Question

PyQt

There is an autoclicker with two Start and Stop buttons.
When you press Start, the clicker works, but the application window does not respond.
You can stop the program by turning it off.
How to fix this problem?

from PyQt5 import QtCore, QtGui, QtWidgets
import time
import pyautogui


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.setFixedSize(250, 250)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.name = QtWidgets.QLabel(self.centralwidget)
        self.name.setGeometry(QtCore.QRect(15, 15, 70, 50))
        font = QtGui.QFont()
        font.setFamily("Attractive Heavy")
        font.setPointSize(18)
        font.setBold(True)
        font.setWeight(75)
        self.name.setFont(font)
        self.name.setStyleSheet("color: rgb(255, 255, 255);")
        self.name.setObjectName("name")
        self.label_2 = QtWidgets.QLabel(self.centralwidget)
        self.label_2.setGeometry(QtCore.QRect(15, 50, 61, 20))
        font = QtGui.QFont()
        font.setFamily("Attractive Heavy")
        font.setPointSize(8)
        self.label_2.setFont(font)
        self.label_2.setStyleSheet("color: rgb(255, 255, 255);")
        self.label_2.setObjectName("label_2")
        self.start = QtWidgets.QPushButton(self.centralwidget)
        self.start.setGeometry(QtCore.QRect(60, 115, 130, 30))
        font = QtGui.QFont()
        font.setFamily("Attractive Heavy")
        font.setPointSize(11)
        font.setBold(False)
        font.setItalic(False)
        font.setUnderline(False)
        font.setWeight(50)
        font.setStrikeOut(False)
        font.setKerning(True)
        self.start.setFont(font)
        self.start.setStyleSheet("QPushButton#start {\n"
                                 "    background-color: rgb(255, 255, 255);\n"
                                 "    border-radius: 12%;\n"
                                 "}\n"
                                 "\n"
                                 "QPushButton#start:hover {\n"
                                 "    border: 1.5px solid #000000;\n"
                                 "}\n"
                                 "\n"
                                 "QPushButton#start:pressed {\n"
                                 "    background-color: rgb(0, 0, 0);\n"
                                 "    color: #ffffff;\n"
                                 "    border-color: #ffffff;\n"
                                 "}")
        self.start.setObjectName("start")
        self.background = QtWidgets.QLabel(self.centralwidget)
        self.background.setEnabled(True)
        self.background.setGeometry(QtCore.QRect(0, 0, 250, 250))
        self.background.setText("")
        self.background.setTextFormat(QtCore.Qt.AutoText)
        self.background.setPixmap(QtGui.QPixmap("../../../memes/images.jpg"))
        self.background.setScaledContents(True)
        self.background.setObjectName("background")
        self.stop = QtWidgets.QPushButton(self.centralwidget)
        self.stop.setGeometry(QtCore.QRect(60, 169, 130, 30))
        font = QtGui.QFont()
        font.setFamily("Attractive Heavy")
        font.setPointSize(11)
        font.setBold(False)
        font.setWeight(50)
        self.stop.setFont(font)
        self.stop.setStyleSheet("QPushButton#stop {\n"
                                "    background-color: rgb(255, 255, 255);\n"
                                "    border-radius: 12%;\n"
                                "}\n"
                                "\n"
                                "QPushButton#stop:hover {\n"
                                "    border: 1.5px solid #000000;\n"
                                "}\n"
                                "\n"
                                "QPushButton#stop:pressed {\n"
                                "    background-color: rgb(0, 0, 0);\n"
                                "    color: #ffffff;\n"
                                "    border-color: #ffffff;\n"
                                "}")
        self.stop.setObjectName("stop")
        self.background.raise_()
        self.name.raise_()
        self.label_2.raise_()
        self.start.raise_()
        self.stop.raise_()
        MainWindow.setCentralWidget(self.centralwidget)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

        self.add_functions()

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "Click!"))
        self.name.setText(_translate("MainWindow", "Click!"))
        self.label_2.setText(_translate("MainWindow", "by SpArr0w"))
        self.start.setText(_translate("MainWindow", "Start"))
        self.stop.setText(_translate("MainWindow", "Stop"))

    def add_functions(self):
        self.start.clicked.connect(self.mouseclick)
        self.stop.clicked.connect(self.powerfalse)

    def mouseclick(self):
        power = True
        while True:
            time.time()
            pyautogui.click()
            while True:
                time.sleep(0.1)
                pyautogui.doubleClick()
                time.time()

    def powerfalse(self):
        power = False


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

Answer 1

Endless loop in one thread, everything works as it should.

while True:
        time.sleep(0.1)
        pyautogui.doubleClick()
        time.time() # зачем это?

Learn python, deal with Qt, add a thread in which the clicker code will be executed.