Growatt Aura 5000 - off grid issue

I have a homebattery Growatt Aura 5000. This morning the WIFI was blinkin. Did a reset, but then the battery did not to the grid anymore. Try to get support from the dealer where I bought the battery, but response is slow and via email I get replies that does not solve the issue.

Anybody familiar with this problem and may have a solution how to fix this off grid issue?