Standard radio loses station

Only started recently, when starting the car, the radio keeps losing the signal to preset stations.

I have gone into expert mode to stop it changing stations and if I press the preset button it will find the radio station again. It also seems to be worse when starting a journey.

Any ideas and is this a known issue?

Thanks
 
Had this for about 4 months now but it's only now and then so god knows what it is
 
I have this, it starts on a station then after about 10 seconds its starts searching. But then if I press the preset button it will stay on that station for rest of the journey.