Thanks for your reply.
I connect to a second card on his server also , which runs in oscam and gives me no problems. I forgot to mention earlier that if I use a basic amiko mini I have no problems. On the amiko I can select different cams for different servers, so I use mgcamd for my internal and cccam for my friends connection. I only have the problem with my VU duo and Tiviar alpha+ E2 boxes. I run the latest Vix image on them both. When the reboot the box all runs ok for another 10 minutes.