3B S2 fault codes

[e//S2]

Has anyone ever come accross a 1111 code (faulty ECU) and a 2234 code (ECU supply voltage too high or too low)? The car is chipped and has an RS2 turbo, EM, injectors, MAF, 7A FPR and exhaust cam. Car runs and drives perfectly and pulls very strong. Only problem is every few days the check engine light comes on. When I pull the codes it's teh same thing - 1111, 2234. After reseting the ECU the light stays off for a few days. What's up here?

Thanks!