i just noticed that i did not mention that the two images are from the different cars, the fist picture is from the "bad" unit in my e39, and the second picture is from the new unit in the X5.
The unit in my e39 also loses connection with the satellites as i described in the first post, is it likely that this has to do with the internal GPS receiver?

The second picture is there for reference to illustrate how much better reception a new MKIV has compared to the bad unit in my E39.

If you do not advice against it i think that i will go with a new GPS antenna (if there is an updated version since mine was installed in -00) and the new trimbleunit for the "bad" MKIV in my e39.