(T) power steering failure/air bag failure, no radio or clocks

ok so i go to jump into my new grande punto yesterday and started her up but i had had no power steering at all lights were up on the dash telling me to check hand book etc

turned it of phoned my warrenty company need to book it in on monday

went back out it was working then i had airbag failure

another time then i started it had power steering but again airbag failur and no radio indicators or my clocks wouldnt work at all no oil temp no revs no speedo

its now all working again

my question is what could this be?
and if i book it in will they still find the fault? even though it seems to be back to normal? i had it from a mazda dealer who put a years comprehensive warrenty on it for me so i know im covered for electrics just curious if they will find the problem ?

first port of call would be to test the battery and alternator

low voltage at start up can do a whole manor of weird and wonderful things

I get the same problem but even though the dash doesn't work everything still does. For example if you indicate it doesn't flash on the dash but externally they are actually working. Mine has done it a few times there's no pattern to when it faults so a garage will never fault it.