2012 207 electrical fault

I have an ongoing problem with my 207, it started with wipers they would only sweep 5 times then stop in random places not returning to park position, then one day the main lights would not turn off and the warning on the dash came up with brake and engine fault
I had to disconnect the battery to reset all was ok until the wipers were operated then i had to disconnect the battery again , I changed the wiper motor and all was fine for a week, now it sometimes wont start when you turn the key and brake failure shows on the dash then if i operate the wipers it starts and resets faults , my thoughts now are a faulty relay , any advise welcome
Regards
Dave