WowAce

What version of Grid2 are you using?

 R936

What game client version (windows or mac) and language are you using ?

windows / german

What steps will reproduce the problem?

Its Random, so its difficult to reproduce. But it occurs several times during a dungeon-run.

 
Did you try having Grid2 as the only enabled addon and everything else disabled?

yes

Was it working in a previous version? If yes, which was the last good one?

I don't know 

Do you have an error log of what happened? If you don't see any errors, make sure that error reporting is enabled (`/console scriptErrors 1`) or install [BugSack](https://mods.curse.com/addons/wow/BugSack).

 No

Please provide any additional information below.

 My problem is, that sometimes (completely random) the health-bar of one or multipile players disappear. It looks like he has 0 HP, but in the Classic-Blizzard-UI I can see, that the player has much more HP.

I already deactivated all other addons, but the problem continued.

Any Ideas to fix that?

I just want to say that i also experience this issue at times in Classic or r939. The player in the raid/party will show 0 HP as if they are dead but they aren't. Eventually Grid2 will fix itself and I can see their HP again.

Check

https://www.wowace.com/projects/grid2/issues/768