No stable Picture Quality P25 with tera2

No stable Picture Quality P25 with tera2

Hi all,
We are using P25 units together with tera2 cards voor extending security video pictures to a control room.
For this we need a good picture quality. Unfortunatly sometimes we are facing a dramatic quality loss on the systems. It starts fine but after a few seconds the picture quality reduces to an unacceptable level. (compressed and blocking).
Does anyone have experiance with streaming video over Tera2 and P25? (direct connected)

Please advise how to solve this issue.
THX in advance!