Region : Argentina

Model : TL-WR841N

Hardware Version : V8

Firmware Version : 8.2

ISP :

Hello, I bought this router from my internet provider and it was great.
After I moved and changed internet provider, router started to give me lag spikes.
It happens every 5-10 min. I use wired connection and 2 pc. On both of them I get
those lag spikes. When I just use internet I don't notice them, but when I play online games,
those spikes are VERY annoying. I tried stick internet cable directly to my pc and internet
works well without any lag whatsoever. But when I use internet through router I get those lag spikes.
I upgraded firmware to wr841nv8_en_3_15_9_up_boot(140724) but still the same.
Used factory default settings - nothing changes. And cannot find any info how to fix it.
Should I buy new router or there is some settings that I can change to fix them?
Btw tried to ping google: Minimum = 64ms, Maximum = 69ms, Average = 64ms.
Sent 175, Received = 173, Lost = 2 (1% loss).
I get from 2 to 3 Request timed out, on every lag spike.
So what I can do to fix it ?