My dad, who has worked a lot in electronics always says this one thing:
99% of problems in electronics are because of a bad power supply
Today, a real experience of this: In 2014 I bought a GSM signal booster to solve the call drop problem at home. It was working fine for all these 2 years, but since a few weeks the calls started dropping again. The booster had come with an 5V 1A adapter which powered it and I never switched off the booster. When I went to check it, the small screen on it showing the signal strength was blank and even after restarting it a couple of times it didn’t turn up again.
So I replaced the power adapter with my old Nexus 4 charger which can supply 1.2A at 5V. And boom, it works. Signal strength improved and calls are clear again. So always need to keep this in mind, whenever there’s a problem in electronics, first check the power supply.