I would try some contact lubricant on the injector connectors.
I use ACF50 for this, which is great stuff, but others might suit.
https://www.ebay.co.uk/itm/ACF-50-Mo...YAAOSwQsNZ0i4x
Although ACF50 is not cheap, an aerosol can lasts me years !
Issues with injector connectors are not unusual for causing misfire fault codes.