What you're doing is a reboot but possibly without giving things enough time to settle down.
If you remove the positive lead for a good 10 minutes then absolutely everything will lose power and gave the chance for a proper fresh start.
This is much more likely to resolve issues long term
You don't say if the car was new or secondhand but it could be that the 12v battery is beginning to fail or the reminds need some attention. A few have found the earth strap wasn't properly secured at the connection to the bodywork so worth checking as much as you can.
Once you reconnect the battery (doing things cleanly with no sparks) you need to wait 2p minutes for the car to go through its full startup routine before doing anything.
At that stage mist will find everything to be in good order, key fobs are orderly recognised, headlights boot up and self check properly and charging issues shoukd be resolved.
Think about it as a network of devices where if one starts chatting nonesense it confuses the whole network when rebooting if one device isn't rebooted properly the others get confused fairly quickly.
Ideally at rest tge 12v battery should be giving you 12.6 volts, if the DC/DC converter is active you'll see 13.6 volts or thereabouts and if the battery is actively charging it can go up into the 14s. The battery will also read under 12 volts for some time if the car has been unlocked. It's therefore a bit tricky getting an accurate reading of the true state of things if trying to do things quickly. Performing a load test isn't easy without the right equipment so it's a natter of unlocking, opening the bonnet, disconnecting and waiting fir a good chunk of time before testing, Vauxhall even state you need to wait a goid 1p minutes or so before disconnecting the 12v so the DC/DC converter has shut down.
The point is if you are having lots of glitches you need to check the 12v battery is I'm good health which isn't as straightforward as you'd hope.
Fitting a battery monitor adapted to use small crocodile clips works well for occasional testing as you can clip it on then lock everything down and test the battery an hour later.
Hopefully all is good and you can take longer to reboot things next time and get a better result.
Gaz
