Lower DL Speeds & Frequent Disconnects After Firmware Update to V4.6.3.7

Hello, I have a RBR750 Router + Mesh System (3 satellites) and ever since updating to the new firmware in July (V4.6.3.7) I've had persistently slower DL speeds (from 900 to ~600 Mbps) and the router and satellites have been regularly cutting out and resetting throughout the day (which has been brutal). 

I know there's another post around slower speeds, but wondering if anyone has had issues with devices dropping or resetting since this update if there are any troubleshooting tips to resolve.