Actions Speed Stuck Slowed

This has happened both in maps, from low to tier 15, as well as at various points in the campaign. Action speed, but not directly move speed, winds up getting stuck at "slow" similar to being chilled. This includes dodge speed, spell casting, attacks, and even summoning a portal. No debuffs are on the character, I can be out of combat for minutes with nothing happening and the slow effect will still be there. The only fix I have found is reloading the map, either by logging to character select or going to a different map/summoning a portal and going through. I am unsure of how to replicate, though it appears to be related to chill rather than a rare monster spawn or something like Temporal Chains.