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Hi just a question may be helpful may not have noticed you have power saving on have you tried with it off? I know power saving restricts some stuff running in background. Give that a shot and see what happens.
Sorry to say power saving off made no difference. Also I have spoken to Samsung and they say it has to be a signal issue with the provider as it doesn't occur in every area within the UK. So any other ideas anybody?
No to be honest I havent as I use Android auto when I'm driving to reduce distractions. This by default uses google maps. I'll have a look at some other map apps to see if the same issue occurs with them.