[Gameplay] Teammate models and vision disappearing

When playing a game tonight, I experienced a large ping spike roughly halfway into the game and my ping stayed at 800 and above for the rest of the game. Prior to this, I had solidly held 48 ping and nobody else was using the internet at all during the entire duration of the game.

This seems fairly mundane, however after this ping spike all of my teammates' champion models, icons on the map and their vision just disappeared, yet the enemy champion models were still visible. I could still see their spell effects, such as our Vi's Denting Blows effect on minions and our Heimerdinger's turrets, however the actual champion model was simply not there. This made co-ordination and teamfighting incredibly difficult and in the end we surrendered as the team no longer had a mid laner who was able to group with the team or react within a sufficient time (due to the constantly high ping).

I'm 99% certain it isn't my internet as I immediately loaded up the LCS stream after the game and was able to watch in HD with no buffering whatsoever.

Has anyone else experienced this?