CR-10V2 Nozzle temp set ISSUE

Hello:
After cleaning up prompted by “print Paused” on the screen, I get pauses more often - now, goes in pause all the time ie, no more printing & “Print aborted” is what I got.
Here is what causes: the preset temperature of the filament I selected during Slicing gets reset to 0 all of a sudden.
Printing pauses immediately.
I could force nozzle temp back to 230 & if it is fast enough, printing resumes with continuity on the object walls.
Is this happening because I selected 230 deg nozzle?( It is mighty cold here at the print place)
Or a bug in the program, electrical line noise?
Will appreciate any hint in the matter.
I will try tomorrow 210 at the nozzle.
-B