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I have absolutely the same 3 problems.

  1. appeared a day ago, when I tried to switch printing from PLA to ABS (increased printing temperature from 190 to 240). This problem is real one and I can't print anymore :(
  2. this issue occurs randomly, when moving to home position. I've never seen it during the print process.
  3. i decided to keep it as it is for awhile

Did you resolve temp drop issue?