Frozen cooldown time usually happens when players tweak their device time.
Depending on how long into the future you adjusted your time, you will have to wait until that day comes. For example, if you adjusted your device time 4 hours into the future, you will have to wait for 4 hours. That being said however, there are times that it won't reset for you as well. Which is why we highly advise against this tempering of your device time.
If you did not tweak your device time but the problem persist, please drop us a ticket and we will assist you.