[EddieJones]

You got lucky, this issue has been around for a while on all EUCON surfaces even hardwired ones like the S5MC. What you are seeing points to a timing error (which is helpful and I'll send this new info to Apple)

As for your network and the use of 2.4GHz over 5 GHz this points to a possible congestion in your 5GHz band and switching your router to use a different channel might help there. 5 GHz is recommended as its way faster and if setup right, gives a better experience. It does however only cover a shorter distance so being within a reasonable range is necessary too. BTW the Ethernet Camera adapter from Apple is the best way to connect the iPad for use with Control when using larger sessions.