Why such a spread in ping?

Question

linux

Not so long ago I purchased this device (RB941-2nD-TC). So, everything goes through the cable, android, connected via Wifi, also normal. But the laptop with ubuntu covers. The router pinged from the laptop, such garbage. There were also 500-800
What could it be?

Answer 1

looked at this myself. but I decided to take
your weak model. so it's not surprising)

Answer 2

weak hardware
torrents
attacks on the router
crooked firmware
wifi channel spammed by neighbors
for tests use mtr - my trace route
mtr 192.168.88.1

Answer 3

Dir-300 is also connected to the microt, in the access point mode, as soon as I open dir-300, the ping levels out. Then again I turn on the 300th, and again there is a spread in the ping. I think channel 300 is spamming. Or am I wrong?