I came to tell something that has happened to me now. The scenario was simple, we had the lead and unexpectedly my team got a massive lag spike at the same time, around 900ms but the opposite team seemed to be normal. However when they capped everything and the match was close to the end, magically our ping just normalized.
I tried to search for other topics of the same kind but I had no luck. I don't know if i am thinking it to much but at least I want to leave a record of this incident.
Thanks and sorry for my bad english!