Anyone else suffering/suffered from this? 2008 GS, my front tyre pressure reading is not constant. The rear tyre pressure reading works correctly with no loss of reading. The front takes about three miles to display from - - to say 2.2. It then intermittently switches from 2.2 to - -. Say reading 2.2 for about 15 minutes and then - - for say 10 minutes. Any ideas why? New sensor required? Got the bike shop to look at it at the last service, but of course it didn't fault when they looked. 

