No text alerts while near my Mac
While in a certain proximity of my iMac, my iPhone 7plus with up to date iOS does not alert me or will sometime not ring. It will also not even light up with a banner either. So, as a result, I have to check by waking my phone display occasionally to see if I have gotten a text. I've turned the phone off etc as it's been doing this for months now, at least through the last 4 software updates.
Ideas?
iPhone 7 Plus, iOS 11.2.6