I’m wondering if I’ve got an issue with my WiFi in the house:

Lately my IPTV service has been running very poorly. Lots of lagging.
The TV has from day 1 been connected via WiFi, as for some reason, the IPTV service doesn’t work when the TV is connected via Ethernet (anyway, that’s a different story).

When I run a speed test, I get decent speeds, so unsure why there’s lagging. Also, we all have no WiFi issues, when using our devices for Zoom calls etc.

Last night I tried to connect the TV to my phone hotspot instead of the WiFi and voila, no lagging!

My setup is fibre (MyRepublic 950 down) with their supplied router and a Cisco 8-port switch with 4 of them being PoE.
I’ve got 2 x Cambium E410 wireless access points installed in the ceiling (downstairs and upstairs).
The distance between the TV and the downstairs access points is approx 3 metres. The TV does say that it’s only hot 3 out of 4 bars for connection.
I can see that the TV is connected to the downstairs access point, not the one upstairs one.

Could this be an issue with:
The supplied modem from MyRepublic
The switch
The wireless AP’s