In the past week, I've installed a TL-WPA8631P kit, however experiencing dropouts on 2 different laptops in Teams and Zoom calls only.

i think mainly in Video calls, will need to recheck.

Both adaptor and extender are already on latest firmware based on TPLink website.

Adaptor was plugged into an extension lead - problem solved I thought by plugging directly into wall socket - but no side, still have the issue

Whislt checking this using tp-plc utility for firmware version of adaptor and extender, I noticed the QoS settings were set to 'gaming' - I changed to 'internet' which had made no difference.  I plan next to change to 'Audio/Visual'

Otherwise, general browsing, share point use not affected so don't believe a VPN issue.

Almost getting line speeds in my upstairs office - 285/45 vs advertised 300/50

could it be anything else?

Note, I did not have the same issue with the previous Av1300 power line adapters - so I know the internet service is ok.