Is there a PVR anywhere that can reliably record and playback UK Freeview subtitles?

I have been using a Topfield 5800 for years which was faultless with subtitles on recordings. That finally died and I bought a Humax HDR2000T. That will record and replay subtitles correctly on most BBC channels but elsewhere they often detach from the video and audio and simply stream ahead, so that they are impossible to use.

Looking for an alternative that might be more reliable, I received a Miraclebox Premium Twin plus today with the latest Open Vix and after setting it up I tried recording and then playing back with subtitles. The performance was even worse that on the Humax, with BBC subtitles as bad as on the other channels. They appear to be completely detached from the video.

World of Satellite can offer nothing, except an RMA. Does anybody know of a box, or an image that is capable of handling recorded subtitles correctly?

Thanks

PaulAB