This is some sort of heavy stress test? You are sending notification every 10ms? That is very fast for BLE. The smallest connection interval (fastest request/response packet turnaround possible) in BLE is 7.5ms. I'd start with sending the notification slower.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
This is some sort of heavy stress test? You are sending notification every 10ms? That is very fast for BLE. The smallest connection interval (fastest request/response packet turnaround possible) in BLE is 7.5ms. I'd start with sending the notification slower.