I'm not an expert on films and their development, but surely can contribute lots of hands on experience with films stored for months at room temperature (which can hit 30°C on hot summer days), both exposed and unexposed.

To make a long story short, I have not experienced a film that would suffer serious damage from this. In your case I would look for other sources of problems. Could you post some samples of a scan, maybe it was a trivial error we can lock down just from seeing the results.