I experienced many freezes and I've been investigating for weeks by OBH 5. Only when I had a spare box I was totally sure the freezes happened the same even with a totally clean image and oscam running.
I've been going on from a clean image and adding one by one something and then testing for many hours.
My conclusion (take it unofficially, yet!) is that the responsible is VPS plugin because the freezes happened again (finally) only after having installed VPS.
But then a strange thing happened: in Solo4K, after weeks of problems, unistalling and reinstalling VPS solved only after the last update.
Maybe it happened by chance.
In the other box, an Ultimo4K, the freeze kept happening and I'm now trying a different VPS binary.
But, above all, what do you mean by freeze? In my case it was a tragic, complete freeze: at times the channel stopped video but I could hear audio.
More often, Rai1HD (but also other Rai HD channels which are, since December, FTA: Rai3 HD, RaiSportHD and others) went on apparently normally, and you could watch the channel but... the box was completely unresponsive: no remote control possible, no webif, no FTP, nothing: I could only switch off.
Is your the same type of freeze or is it just a temporary one?