Meaning, next time it happens, try:
-- powering phone down and wait a minute -- taking note of service speed (3G, 4G, or LTE) and signal strength;
-- power phone up and you will likely see an immediate boost in connection type or quality.
If online and using data, I do this every hour or when speed drops and it's worked every single time. My conclusion is cell providers are screwing with signal strength when their bandwidth is high. Just another reason to despise them, AT&T sucks in my case. Never experienced this, ever, with other providers, though.
Edit: I also use the phone as a hotspot and the glitches and fix applies to my laptop identically as they do when viewing here on the phone.
Edited by E1pix, 08 July 2018 - 18:23.