Wifi Adapter problem

[matew312]

I had a tp link adapter, after like 3months my internet connection started to drop to 1mbs, then i could restart router and it would work for plenty of minutes and then it would drop from 100 back to constant 1mbs. So i bought a new more expensive one. But today(i think again something like 3months) the same thing happened. I am using TP-LINK TL-WN822N. Is this problem of my router, adapter or someting else? I will appreciate any help

 

[hang-the-9]

Is this happening on only one device? Does it work OK on ethernet cable?