Venu 2s suddenly goes blue triangle on everything. No obvious solution found so far in the community.

Hi. Just bouth a Venu 2s, 2 weeks ago. Worked well initially, but today it suddenly began restarting with blue triangle screen almost continously. When trying to start a run, when I call my phone it turns off and vibrates continously until i hang up, if I try to start any other activity or enter a submenu the same happens: Blue triangle, vibration and the watch restarts. Sometimes the touch feature also stops working. I´ve tried everything. Hard reset of the watch x more, turned on/off both watch /phone x many, logged out of apps/garmin etc,  tried connecting via the computer to search for updates, recharged the watch fully. Everything without luck. Any suggestions ?