Ok, things got worse and no matter cold or hot the system booted after about 4-6 attempts. Then it run ok... but occasionally it froze even w/o any special CPU usage.
Sooo... I had to do something and as KLL wrote in his great walk-trough i followed it. I did everything except testing for bad sectors etc. (POINT -e-)
BTW1: is using Gparted an option for not using all those CLI commands at the end of that article or is it another point? ...and also, for future use, how to scan with Gparted when a certain partition is mounted - is unmounting it gonna do any harm, OFC when i'm not running on that system and the card is in a card reader, and also how to mount it again?
...but for now everything went back to normal - no errors when booting (don't want to jinx it - as it's running for around 1h by now so I'm not 100% sure (made many boots, and breaks in usage between them - not a single error I HOPE IT WILL STAY THAT WAY
It looks like making an image, then formatting, [email protected]
and reinstalling that image worked for me. Also h2testw showed NO ERRORS,
BTW2: is writing 17,7 MByte/s and reading 62,5 a good outcome? - that's my ADATA 32gb outcome on h2testw.
Everything went smooth, but don't close the topic just yet, we'll see in a day or two if everything is really ok, i will let you know and then it can be marked as SOLVED.
And once again many thanks for all the RPi community especially KLL
We'll be in touch, cya for now