Possibly enemy summon-related, when damage is dealt to the enemy Orbweaver hero? Although I had thought similar reports cropped up at his release and were considered/fixed.
Bears similarities to this thread, although that was with a different mechanic (Summon upon Enemy death):
Actually, yeah, your second post looks exactly like the old issue in that thread (freezing upon an A. Weaver summon triggered by a Vash devour).
Also, Devs will often ask for your Talent loadout (I see you’re using Plaguelord) as part of the complete team info to help try to pinpoint the issue, so perhaps include that and enemy teams as well!
First enemy team looks like it would have originally been Webspinner, Doomed Club (Orbweaver), Apophisis, Fist of Zorn?