We have 2 key fobs with the car a 2019 Skoda Fabia NK3 1.o TSI, we have owned the car from nearly new 2 months old,  up until last year both keys worked as normal one press to unlock drivers door 2nd press unloks all the doors, then one day went out and left the keys in the tray by gearstick to get fuel happened to shut the drivers door and then the car locked itself trapping the keys in a locked car, rang my daughter and she brought the spare key from our house and car unlocked but when pressing the start button (keyless start) we had to hold the key against the right side of the dash, car started and no problems but then noticed that now the one key fob opens all the doors hatch etc on one unlock press and the other fob you have to press twice for all doors to unlock 

My only concern is every say 3-4 months when you press the unlock we get a rapid click click click and tutn light flash but goes aroung 6 times not the 1 or 2 times  as normal ,when you try to start the car the dash shows key is not reconised and you have to hold it near the right hand side of the steering wheel it then gives a loud alarm type bleep and everything is ok again ,had it plugged in but they cannot find any issues and say bring it in when it lays up which is really impossable as you never know when it's going to happen and again you need to start the car to take it to the garage, just wondering if anyne has had this sort of issue, batteries in key fobs are changed every year we never wait untill message comes on the dash,have used energizer lithium and duracell button batteries not cheap generic ones

I'm (almost) sure this topic has come up (on this forum?) before but I can't remember the outcome or solution (was it you?).

 

What I'd try is remove the batteries from both fobs, then replace the battery on one fob only and synchronise that one fob.  Details in your car's Owner's Manual  Then place this first fob well away from the car and the other fob, put it in a metal tin or whatever to fully isolate if from  the other fob.  Put the battery back in the other fob and synchronise it to the car.

 

I find it best to alternate (in whatever time period or way suits) the use of the two fobs so there is even wear on them and then you always know where the second/"spare" fob is and that it at least worked the last time you used it and that wasn't year(s) ago.  With these silly KESSY fob things best to keep the one not in use fully isolated from the car and other fob.

 

I would also see about getting a full scan report for any errors that might be on it, and then delete any errors, this of course needs to be done with an appropriate, and appropriate level, scan tool.  The scan tool does need to be fully up to date with the programs for your car, many scan  tool owners are too lazy or haven't paid for the service and again the scan tool has to cover what you need.

 

If you don't have access to such a tool then you could see if there's a Briskoda member that has what you need and able to help, perhaps for a few beer tokens, do check, some are pro services. -  Briskoda VCDS Owners Map (click me)