I have fibre optic at home. Connection via Ethernet is mostly reliable with sporadic dropouts. I mainly use wifi at home and this is where the problem lies.
We are in an apartment, so lots of networks about. Our wifi is very unreliable. Have had various technicians, both from provider and private, look at the problem but it's ongoing.
It's a large apartment. In the room with the router things are A bit better than in the rest of the home.
We have tried the following solutions:
1- PLCs. Two brands. Limited success as apartment was built as two residences, so has two independent electrical networks.
2- wifi range extenders. Two models, both TP-Link; TL WA850RE and RE200. Seem to create conflicts but no improvement on connectivity throughout home.
3- additional router. Passed cable from one side of home to the other, added a quality wifi router. Tried with identical network names/passwords. No help. Tried renaming the second network.
Generally find that connectivity is good for a while, then goes pear shaped.
We have a mix of Windows 7 & 10 laptops, and iOS devices (phones, iPads, MacBook air) all on wifi. Wired devices include a Marantz cr710 music centre, plus Apple TV.
I've kept this short but can provide more details as needed for anyone with patience and interest.