The windows on my daughters 16 plate Fiesta froze shut the other day. She found out when she tried to open them! Since then they have a mind of their own, opening sometimes, refusing others even when not frozen. I sprayed some silcon oil on the rubber seals and it seemed to sort it, but today they wouldn't open again for a bit and then,10 minutes later, they did! This is a problem with the windows both sides and from either door switch.

Anyone any suggestions for whats going on please?

Thanks.