warning lights come then go!

i have a fabia vrs se,been having warning lights coming on then going( pas,esp and sometimes coolant sensor)coolant level fine, no error codes when scanned. pas comes on either 1st thing in morning or after hard right hand turn,turn off and on again it goes. Battery has 12.2-12.4volts,checked fuses,ok. the radio sometimes jumps channels at same time as warning lights coming on,could this be the battery on its way out? even thou no battery light comes on. power assist does go and its not just a warnig light,but if it was the pump,wouldnt this keep permantly on as well as a code+light? please help

cheers mark