Diagnostic tool - can't launch it

[arado]

My diagnostic tool stopped workin. Everything was ok, than the problem began, without any markable reason. First issue was when the ime of tottaly phone usage changed into –27133 hrs value. For now I can't run it at all. " We are very sorry but the diagnostic tool stopped working " is the only reaction when I try to run it. I've tried to download app from Google store but it doesn't help. Any idea what to do? I don't want to "upgrade" from 4.4.4 to Lollipop 5. It's worst case scenario... Thnx!!!

[Hampus]

Hi,

Have you tried to just restart the phone to see if this can help? Otherwise, you could try to clear data for Diagnostics via Settings > Apps > The tab "All" > Diagnostics > Clear data.