Advice: home network

[Valheru]

Current setup:
Study (main) - gaming PC + fibre termination with wi-fi router + tp link AV600 powerline adapter
Bedroom x2 (< 10m away) - android tv box
Bedroom (~20m away) - desk for laptop via wi-fi
Living Room (~30m away, multiple walls) - AV600 access point for wifi + tiny PC (ethernet on AV600) + decoder (ethernet on AV600)
AV600 - dedicated plug via 2-point adapter on both sides

Issue:
The AV600 loses signal between the adapter and the access point, i.e. internet connection lost. This happens a few times a day (under fair amount of usage) and is annoying as it takes a few mins to reconnect. I originally thought the AV600 was borked so I replaced it with a new one and the issue persists. Also replaced the plug in the wall with a new unit to eliminate dodge connection/wiring.

Question:
What setup changes should I make to make sure I still have network as per current setup that won't cost an arm and a leg.
- Just pull a cable and add another wi-fi router in living room (cable truncing available in the wall)
- Wi-fi mesh kits are stupid expensive
- A set of repeaters (unsure if viable)

 

[ThatGuy_ZA]

Run a cable and get a Unifi AC LR if possible

 

[Chuck_Norris]

Forget powerline adopters.
Forget repeaters.

Get cable to most rooms and tv/devices. Then decent ap's. Either Mikrotik or Unify. The run of the mill ap's are not up to the task and require regularly restarts.
I use Mikrotik with up time around 180 days without the need to restart any of them.

 

[iamgigglz]

15m radius? You could probably disable the wifi on your router and have a wired AC-LR access point in the centre of your house feeding everything. Two APs would be better though.
I had a miserable experience trying to get my router's wifi to play nice with my Unifi AP's wifi. Best experience with Unifi is all or nothing.