I have Maulie + Tayrel on my arena team, and Maulie is in Frost Gear. If "Freeze" procs, and Tayrel then follows with Preemptive Strike (which he often does on Auto) and the skill applies the stun debuff, then the game freezes. This happens 100% of the time as far as I can tell.

Platform: Android, OS—9.0. Galaxy Note 9. 

I don't have a screenshot handy, but if it happens again because I'm dumb, then I'll do so and add it to a follow up post, but this should be rather easy to replicate for the devs.

No other debuffs are applied at the time, but the frozen enemy may or may not have various buffs from their team. Provoke has normally expired by then, and I open with Acid Rain.

Team details (if they matter):

Kael, Tayrel, Zelotah, Maulie. Tayrel leader. First three are level 60 with various masteries, Maulie is 50 and only ascended to 3-star—her passive is booked, if the TM manipulation is what's impacting things.