Jitter and packet loss during every match

[charlie retro]

Currently experiencing significant stuttering and choppy performance in every match, no matter the time, especially when nearby other players, e.g. in team fights. This is happening only in Deadlock and no other game.
Here are some of the screenshots I took during these hiccups, the jitter graph goes crazy with, assumingly, packet losses.

 

[IzmGunner01]

Same here, game is unplayable with this much jitter.

 

[vintageholo]

Also here, the jitters and ping spikes after the patch has been more frequent.