V3 slow to connect cameras

Noticed over the past 3 weeks or so my v3 cameras are very slow to connect (up to 10-15 secs), and often drop their resolution setting to 360 or SD (from HD). Never acted this way before. I haven’t changed anything. On iOS…. Device Firmware 4.36.10.4054 which shows as up to date. I have 5 v3 cameras in a group.