Se bloquea GO750

Buenas tardes. Tengo dos GO 750 los 2 llevan lo mismo, uno va perfecto el otro cuando lleva un rato encendido, al tocar la pantalla se bloquea y se apaga, vuelve a arrancar y se queda en la pantalla de inicio hasta q se queda sin batería. que puedo hacer lo he borrado y se lo he vuelto ha instalar y sigue igual.

[TomTomGo]
DeviceName=TomTom GO
DeviceVersionHW=GO 750
DeviceSerialNumber=W7
DeviceUniqueID=
RamDiskVersion=20130404
BootLoaderVersion=55259
LinuxVersion=842337
ApplicationVersionVersionNumber=9510
ApplicationVersion=1234792.1
UserLanguage=Español
UserName=
LastConnectionTime=Never
GPSFirmwareVersion=2.16.201 77382
BuiltInColorScheme0=Belgica
BuiltInColorScheme1=Brittanica
BuiltInColorScheme2=America
BuiltInColorScheme3=Germanica
BuiltInColorScheme4=Australia
BuiltInColorScheme5=Deuteranopia
BuiltInColorScheme6=Greys
BuiltInColorScheme7=Antarctica
BuiltInColorScheme8=Africa
BuiltInColorScheme9=Astra
BuiltInColorScheme10=Asia
BuiltInColorScheme11=Brasilia
BuiltInColorScheme12=Concordia
BuiltInColorScheme13=NewAnglia
CurrentColorSchemeBuiltIn=11
CurrentVoiceInfo=Carmen
CurrentMap=Europe_South
CurrentMapVersion=985.8155
Traffic=N
CurrentFuelpricesType=
CurrentFuelpricesTypeString=
CurrentFuelpricesLastFullUpdate=
ValueRatio=CDmOI/qvj0HnC/PZGQ==
Features=PlusOrRDSTMCTraffic,PlusSafetyCamerasDynamic,PlusSafetyCamerasStatic,PlusFuelPrices,HDTraffic,PlusTripReporting,OnDevicePayments,HidRemote,HomeBackup,ASR,ASRCnC,TTS,TTSCompressed,TTSLoquendo700,PhotoViewer,PhotoJPGViewer,PhotoBMPViewer,VoiceBrowser,LinkVolumeToNoise,MapShare,Newyork,Itinerary,Caymann,Durham,Leeway,Handsfree,PhoneFeatures,CarSymbol,TextureRendering,ExtraSounds,UserSkin,RichPOI,FrequentDestinations,PermanentMapCfg,RDSTMC,Bluetooth,SDSlot,InternalFlash,Microphone,SMSSupported,SettingsOverride,SDK,USBAccessories,MultipleMaps,Traffic,MapOverlays,Documents,WarningSounds,DangerZonesCameras
UnsupportedFeatures=PlusDownloadDynamic,PlusDownloadGeneral,PlusDownloadMap,PlusDownloadPOI,PlusDownloadScheme,PlusDownloadUpgrade,PlusDownloadVoice,PlusDownloadRingTone,PlusMessageNotification,PlusForceMessageNotification,PlusPushChannel,PlusTraffic,PlusWeather,PlusEphemeris,PlusBuddies,PlusRoadConditions,PlusFuelPriceTimestamp,Hercules,HerculesTraffic,Oxford,TrackMe,GPRSEngine,VoiceRecording,TTSUncompressed,TTSNuance51,MP3,IPOD,MusicPlayer,Games,LinkVolumeToSpeed,ZeroVolumeSupported,CaymannAlwaysOn,MAC,DepartureAdvisor,RouteInfoBackToSummary,VehicleProfile,MapShareVehicleProfile,3DCarModels,InternalModem,Prague,HardDisk,ExternalModem,Keyboard,SupportKeyControl,SupportGetAMap,Work,WorkEnabled,WorkPromotion,WorkTuria,WorkMurcia,WorkBremen,WorkUsePlus,WorkStartUpPromotion,LiveServices,SimpleMapBrowserButtonBar,HTTPActivation,AltDefaultCarSymbol,ArrivalSounds
SupportedPatchTypes=3F
NrSupportedErrorTypes=138
UserPatchDatVersion=102
CompressedPatchVersion=200
MapServerPatchDatVersion=105
DeletedPoiDatVersion=200
ServerLineIndexDatVersion=102
ServerNameIndexDatVersion=102
MapShareSupportedProviders=243
CharacterSet=TTU
VehicleBrand=
VehicleModel=
VehicleOptions=