Default [Q] gps fix lost every hour while in use with tomtom


i have a dutch galaxy s4 9505 which i have used with joy for over one year.

only consistent problem is with tomtom use.

after one hour of using it, it will lose the gps fix and it will not come back until i restart the gps service and/or tomtom.
when trying to continue with google maps, also no gps fix is found.

the surroundings are always different, open air so reception should be good.

im still running android 4.3, disabling the software update service for the 442 update (im happy with using the application permission manager and do not want to re-install my tomtom.)

what could cause my gps fix to be lost after one hour?