Thomson PVR10UK + SiliconDust cachecache, using network connection + AltEPG.
Have had to do a hard reset on the TiVo unit a couple of times over the last few days. In all likelihood it's a side effect of a STB needing dailt retuning/overheating/HDD wearing out (again), but posting here just in case others using AltEPG have similar symptoms.