Starting issue

Hi all I’m looking for a bit of advice, Iv had three fault codes come up on my Audi A6, the 3 L V6 automatic model 2011. The coil light is flashing and struggles to start with the push button. Unless you keep the button push down start a motor sounds healthy and it doesn’t struggle it just cuts out if you press it and release it straight away, the fault codes are p26fooo/p26f200/p305200 all to do with the starter motor circuits I’ve been told there may be water or damp on the connections. Has anybody experienced this before or have any solutions or advice thank you.