I read on the German forum a1k.org that the Indivision has problems with the Blizzard 1260 from Phase 5 and the Blizzard 1260 from DCE which I have not.
Have you already tried on a standard amiga 1200 without any expansions?
You could try to load some games or Workbench from floppy and see if this problem occurs for a couple of hours.
The last firmware of the Indivision is 1.5.
Which PSU do you use?
Do you have a PAL or NTSC monitor?