Lol nah not frozen but once I left some contacts in my case and I didnt want them anymore....few weeks later I took a look at them and all the solution had been absorbed and the contacts had dryed out and were hard like plastic, I got some solution and softly rubbed it into them then left them in solution over night and they were perfect the next day I put one in and it felt fine. Then I threw them away coz they wer ugly lol.
(I know its prolly not the best thing to do and would not suggest it to anyone incase of infection, just thought it was slightly interesting!)