I have had the same problem with FlarmView. Noticeable when many targets are around. e.g. in the start cylinder and then once out on course with fewer targets, it returns to normal behavior. Frustrating as it essentially becomes useless as a display while it is exhibiting this rapid cycling between the splash page and the default start page. My setup is PowerFlarm core- S80 (DB9) and FlarmView (RJ45)- Avier XCSoar (through the S80). No problem with the GPS signal from the core.