ErrorDeviceLost during Sasan fight

Hi,
Bug Report ID: #2679172508

It's second time ive lost 6x tier5 mappers due to this bug, when fighting Sasan boss he has invu phase at 50% of hp which causes vk::Queue::submit::ErrorDeviceLost exception crashing the game and in the end making you lose your mappers as it cannot be rejoined.

I know i wont get reimbursed for gold wasted on those mappers, but kindly fix it already.