I have had incidents of spells being failed to cast, resulting in the loss of mana but the spell not activating. This is the important part, this occurs on my turns even opening turns before any enemy can cast counter spell. I can also recast the spell on the same turn, and the spell generally executes properly on the second "turn"
Anyone else has this issue? Another annoying thing about this is its unpredictable and I can go turns with no issues, facing the same opponents, to having the issue pop back up. Again this is not due to counterspell or anyother spell counter since the issue always happens on my turns. And opening turns.