Why is zero degrees on NodeMcu V3 + DS18B20?

Question

Firmware

NodeMCU v3 board, DS18B20 connected to it. Suddenly it starts to glitch and periodically give out zero degrees, although in reality the temperature is below zero outside. Glitches come in batches, then the correct temperature, then again a few zero values. This behavior is irregular. It was a few days ago, it lasted 10-15 minutes, today it repeats, the duration is already about four hours, before that there were no problems for several days. The NodeMCU also unloads the voltage, it is stable, I don’t know how it measures it, but the value is 2.93-2.94 volts. Always.