@tempo10 Thanks for that information but unluckily for me, none of the programs I listen to are listed there but I'll keep checking, just in case.
However, I just checked my Favourites on the Frontier site and my programs are back. And similar to amadcitrus, they are all WMA format and are dated either 23rd or 27/28th Sept. , and they all play as normal on my Stream 63i.
And while I've been typing this, and also the same as amadcitrus they're gone again, but my radio is still playing one as I type.....but now it must have synced with Frontier and it's stopped playing with the message "Cannot open selected media" and after switching to DAB and then back to internet radio I'm back with "No shows available".
Ah well, back to waiting for a permanent solution.