Computer stopped seeing usb-storage?

Question

USB

For some unknown reason, the computer stopped seeing microSD cards in phones. The cards themselves are seen in phones, formatted, data such as photos are stored on them. A tablet on an android is seen when connected to a computer, but if you go into its file system it is empty there, although in fact there are a lot of files there. Other usb devices like mice work without problems. That is, file storages are not seen. Who faced? Mother asus last year, axis ten 64 bits. Truth on ubuntu with DVD also does not see. At first it stopped seeing on one phone, I decided that the problem was in it, moved the card to another, saw it, started copying files, after a while it also stopped seeing.