Hmm that's odd, shouldn't matter if you install LOS from local storage or sideload it. The only reason I do is that some old version refused to install correctly when doing it locally, sideloading it through ADB was the only way I got it to work. Just kept doing it that way since, out of habit more than anything else.
Might misunderstand what you try to convey though? Also, guess it won't hurt to give it a try
Same problem here,date and time is always the time from the first start after flashing, changes about one minute later when phone has fully booted.
GPS not working as well and my signal strenght is really bad since flashing newest 18.1, starting a call takes sometimes about 30s until it starts ringing and people don't understand me and I don't understand them.
I have to go back to modpunks 17.1 from december 2020, that one was working like a charm.
Hope I can downgrade without installing Stock again like @.kaputnik. wrote?
Well, the way I did it does involve reinstalling stock. You completely wipe the phone (I believe at least, as mentioned I'm no expert), install stock, and then LOS + Gapps on top of that. You never boot stock though, if that's relevant.