Tie Arduino - ATMEGA328P reset pin directly to +5V?
Application notes related to RESET are in Atmel AVR042: AVR Hardware Design Considerations, Connection of RESET pin on AVRs paragraph. I would not connect RESET directly to +5V but via external pull-up resistor. It does not block RESET and leave option opened just in case is neeed. Or what about leave it floating and use RSTDISBL to disable external reset by FUSE.