Orange EPC Light + Start/Stop + 'Juddering'

2017 Skoda Kodiaq 1.4 SE TSi Semi-Auto (55k miles)

My wife was driving and said she experienced juddering when in traffic. Also, the orange EPC light and a Start/Stop error. Managed to get it to a local garage, but no faults when they ran the diagnostics and nothing more they could do other than reset.

Over the following week there were intermittent orange EC light and the start/stop error, so we took it to a local VW group specialist that we generally use for most of our cars. They diagnosed this as a faulty injector coil (based on the code), but not something they had seen before as failing. £600 later and we assumed all was going to be ok.

It felt like this was always happening after the car had been sat for a few days, so I took the car on my 40 mile commute. The first morning (after the car had been sat for 4 days), the EPC light was on after driving about 50 yards, entered into limp mode and threw up the start/stop error. After about 2 miles it went off and the car was out of limp mode. 3 x 40 mile trips after that, and not a single issue. Had a friend plug his code reader in, and zero faults!

I did experience the juddering a bit yesterday on a short journey, and this seem to be a case of it running at much higher revs than you would expect (4k +) so jumping when it was changing gear.

I don't know if the injector coil was genuine or a symptom (code) based on something else, but my gut is telling me that the battery could be on the way out. Does that sound feasible?

Also, if looking to replace the batter (I'll probably use a mobile fitter so that it can be coded), are there any battery brands you would avoid or recommend?