If it worked "for some time", then i jave to agree with tourette that this sounds like a hardware problem.Answer to 3: Worked after reboot for some time (no power down)
Best test would be to revert to the MP version you used before.
I do not understand a single word of that localized .net error.Will take some time to attach the full logs because the log collector crashes:
just add all logs into a zip file.