Error: Could not signal service com.apple.WebKit.Networking: 113: Could not find specified service

I am running a game in Xcode 12.0.1 and have Ad mediation enabled for ads to show every 5 levels within the game.
When the ad does eventually show it freezes on the first frame and none of the buttons on the ad (mute, close) work. The only way to proceed is to quit the app.

The log keeps showing these warning messages:

2021-02-15 11:42:55.557528+0000 Guess the Flag[7006:13470968] [FairBid 3.12.0] Mediation: adapterDidShowAd: fyber
2021-02-15 11:43:01.184769+0000 Guess the Flag[7006:13470968] Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
2021-02-15 11:43:01.188248+0000 Guess the Flag[7006:13470968] Could not signal service com.apple.WebKit.Networking: 113: Could not find specified service
2021-02-15 11:43:01.949417+0000 Guess the Flag[7006:13470968] Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
2021-02-15 11:43:01.952297+0000 Guess the Flag[7006:13470968] Could not signal service com.apple.WebKit.Networking: 113: Could not find specified service

I'm not sure what to do here, any help would be greatly appreciated.

Many thanks