Been noticing that randomly, for no real reason, that my card play is getting blocked in PvE and story missions, typically during extended games where i need to max out my unit count to take a single objective (like killing a dragon, or destroying a base). This is particularly frustrating because my cards are not upgraded, and i dont have many, and NEED heals at this crucial battles to keep my units alive as they almost always die in 1-2 hits, so having card play randomly blocked makes the battles unwinnable, especially if the 'boss' is supported by healers who are BEHIND them and cant be reached without losing all my units.
The worst examples of this seem to be in the map behind enemy lines, in which the ENTIRE north western corner is blocked from card play, and the dragon has 3+ healers that can heal him behind the walls, making it literally impossible to kill them without first killing the dragon. Theres also another space to the south, just right of the south western camp, again making it nearly impossible to kill the dragon with level 1 cards.
Is there any reason to block the ability to play cards in this area, other then to create artificial difficulty? Or is this a bug?
Only slightly related, when i DO manage to brute force past this issue (after spending over an hour spawning a single unit at a time to max unit count to kill the dragons) the game crashes and i dotn even get credit for completing the map, or gold, or any upgrades :<