Advice please. In a teams meeting today two of my ‘subordinates’ appeared to be messaging each other on the side - both were laughing/smirking at the same time whilst I was speaking, whilst looking at their screens. I have concerns about the performance of one of them and whilst the second is performing well, they are resistant to taking direction from me. We’re working on a tough project and I don’t feel great about my leadership of it recently so this happening has made me feel really paranoid. How do I address the apparent behaviour professionally? I do feel like I need to nip it in the bud. Very grateful for any thoughts!