Is your plug running Tasmota?
Which Version of Tasmota?
The UL-P10W plug is rated to 3540W - I've used it with a 3,200W Geyser and no problems.
I'm running Tasmota 8.5.1
AFAIK, some factory Tuya firmware devices will stop working after 7 days if firewall blocked from contacting the C&C...