Question about smart key

[STG]

This morning on the way to work I got a message on the screen saying smart key not detected.

OK, so I had the in my right hand trouser pocket (as usual), I unlocked the car by pressing the handle button and got in, then pressed the brake to get into ready mode and off I went to work, about 10 mins later the message started to flash up on the screen for approx 2 mins and then stop being displayed?

Any ideas? Fob Battery (Only 7.5 months old the car is)

 

[Ian Key]

Replacement key fob batteries are only a couple of quid for two from Amazon so it wouldn't be expensive changing it for a new one.
If you swap the keys over so you use the spare key and leave the other in the house do you still get the warning?

 

[Goldwing]

I was told by the dealer that the phone and car key should not be in the same pocket. There may be frequency disturbances.

 

[siteguru]

I'm somewhat sceptical about the validity of that advice ... but I'd never have them in the same pocket anyway as it would be either a) uncomfortable, and/or b) not healthy for longevity of the phone's screen.

 

[Kithmo]

I was told by the dealer that the phone and car key should not be in the same pocket. There may be frequency disturbances.

My phone would be dialing someone up or opening apps if I did that, it does it even when it's in sleep mode.

 

[STG]

Phone was on the charging mat at the time

 

[DannySB1]

If I had to guess I'd say it's the fob battery. I used to have a similar thing happen on my old Renault Kadjar while driving. That key went through batteries like nobodies business.

 

[ari197]

I was told by the dealer that the phone and car key should not be in the same pocket. There may be frequency disturbances.

Yup, one time I could not unlock the door by pressing the button on the door handle and it's because I had the key and phone on the same jacket pocket