VE.Direct 12/375 Inverter switches off and on

Dear Community,
I set up a small pv system with the following specs:

Panels: 2x 100 W mono in parallel
Charge Controller: Victron SmartSolar MPPT 75/12
Inverter: Victron VE.Direct 12/375
Battery: Dyness 12V 100Ah LiFePo4

My problem: Every time I connect a laptop charger or the TV, the inverter switches off completely. After one or two seconds it switches back on and works normal. I have tried different batteries and charge controllers - the problem persists. Only if I connect an AGM batery, it works tiptop. What could be the problem?

Thanks, everyone!

Cheerio,
Jan