Missing notifications on my Android app

Hi,
Setup:

我写了一个自定义配置文件/服务应用on. My custom service has two characteristics (1 and 2) and the Characteristic 2 is enabled with notifications. I've designed the notification size to 154 bytes, I exchange the size of notification with the client. I have a timer which expires every 200ms, when it expires I will send a notification i.e. once every 200ms I send a notification of 154 bytes. I have an android app with which I'm connecting to my Murata DA14580 EVK.

With that as the setup.

Observations:
I observe on my android application that I miss several notifications. However, if I either increase the timer duration, keeping the pay load size constant or by keeping the same timer duration if I decrease the notification's payload size, in both these cases I don't observe notification loses.

1. Has anyone else come across such an effect?


2. Does Android BLE implementation has any limitation in the rate or/and size of notifications that it can receive?