Beyonwiz IceTV EPG going blank (on DP-S1 and DP-P2)

[awoods]

I have two Beyonwiz units - a DP-S1 and a DP-P2.
Both of these machines are experiencing a problem where the IceTV supplied EPG is going blank on the Beyonwiz.
The only way to (temporarily) solve this is to reset the EPG (Setup->System->Initialise->Clear EPG Disk Cache) and the Beyonwiz will reload the EPG from IceTV.
But a few days or so later the EPG will go blank again.
This has been happening on-and-off with my DP-S1 for perhaps 6 months.
I bought the DP-P2 second-hand last weekend and the same has just happened with that unit.
Has anyone else experienced this?
I am wondering if the problem might be related to the IceTV EPG update...?
Very puzzling.