I too experienced this issue.

I frequently take lower level players to the hospital. I coincidentally had a 5x damage buff, from fighting the archangel. I died quite often and unexpectedly when encountering small mobs of ghouls. My character was level 42, which is not a level that would die often in the hospital. The issue resolved itself after the buff ran out. Usually I only die while killing in the hospital if I'm chatting.

Thank you for your attention to this issue.

Novangeline aka Gryffinorren aka Annamandra aka Troilus aka Prosurpina aka Shamandar aka Xamantina