Qashqai +2 trip computer problem

[Tonk1062]

Hi can you help ? I have a 2010 1.6 petrol Qashqai +2. It seems to have a problem with trip computer. The miles left to empty keeps changing dramatically. The clock keeps resetting or disappears altogether. The seat belt warning light stays on longer than it should sometimes . The outside temp displayed is often very wrong. The visual display is fine but the information is incorrect quite frequently . Has anyone experienced this or have any ideas ? I have tried restoring factory settings . I haven't tried disconnecting and reconnecting the battery. I wondered if that's worth a try ? Any help will be greatly appreciated . Many thanks Neil