Battery and washer issues 2018

I bought my kodiaq 7 seater 2018 at 6 months old nearly new from a dealer.  Within weeks it needed a new battery which was done under warrenty. Its had 2 more since and x2 when left at airports the battery has died. Its such an issue that we have a spare battery jump start kit under the seat. Garage, an auto electrician and dealer all looked at it. All unsure whats wrong. Had software update but still issues with electric windows not always working. Was OK when left at airport  but I suspect they kept moving the car hence it was running over regularly,  as they had the keys.

Now the washers don't work despite having a full bottle of wash in the tank and they're not blocked. Garage looked x2 and still can't fix the issue. Now got option of trying another Skoda specialist Garage or back to dealer who are useless. Help! It needs to be fixed it or will fail next mot!!! I saw a post saying washers may need replacing front and back. Are both issues likely to be connected and why can't the dealer figure out whats up? Feeling gaslit!