Kia Rio 1.4 2012 with Keyless Go Problem Locking

Hello, I have a problem with my Kia Rio from 2012. The vehicle has a ZV with FB, and also Keyless Go. Occasionally and completely arbitrary my car can no longer be opened. It then works neither Keyless Go, central locking or directly key in the lock. Driver and passenger door remain locked. Only the trunk opens in all 3 attempts. The error occurred the first time about 14 days ago and since then determined to the 10 times. It behaves like this. , that I try for minutes until the car can be opened after all. The last time even the alarm went on. Possibly the car unlocked briefly (for maybe 1 second) and then immediately shuts the doors again?! Light does not at least go on in and on the vehicle. Does anyone have an idea what that can be? Door locks would rule out, as both doors are affected. It will probably not be a specific problem with Keyless Go either. I hope for help greeting, Anni