Hi, I have a RPi3b+ and a new RPi4b. I have the following problem on both but mainly the 4b. The problem/issue is the lightening bolt voltage warming appearing a lot on the 4b, sometimes on the 3b.
I've read this is caused by non-official power supplies. I have bought 2 non-officials because they have an on/off switch but the cable is of course cheap and I assume that is causing this issue. I like to turn my Raspberries off after use as I didn't want to damage the input socket by over removal and insertion.
My question: before I splash out on 2 official supplies, why don't they have an on/off switch?