@chim57 please i am having the same issue. here is my firmware version  1.16.00.9.1 v0001.0 Build 191223 Rel.66638n

TL-MR6400(EU) Ver:4.0

Hi, im also having the same issue
Firmware:
1.16.0 0.9.1 v0001.0 Build 191223 Rel.66638n

Any solution to this yet?

@chim57 can you send me the latest firmware for Tp-Link mr100 i have the same disconnect problem, thnx in advanced. 

@Kevin_Z hi,  have the same issue. Router is new and I will give back to amazon if I don't solve the issue. Could you please help? 

Here the actual configuration:

@Sunshine @Kevin_Z 

I am sharing my info here, trying to get this issue solved, before escalating this issue to a bigger platform.

Model: TL-MR6400(APAC) Ver:3.0

Firmware Version:1.3.0 0.9.1 v0001.0 Build 200402 Rel.63263n
Hardware Version:TL-MR6400 v3 00000002

Country: Malaysia

Service Provider: Telekom Malaysia

Service Plan: Unifi Air

LTE Band: Band 5 (only this available in my area)

Issue:

frequent disconnect from the service when using the router, mininum once per 2 hours. Internet service provider proved no issue as the same simcard works fine in my tablet to act as hotspot. So far the only way to recover connection is to restart the router.

attached screenshot before disconnect:

will update this reply with screenshot after disconnect next time.

P.S. unable to access system log, will show blank even waited for long time so should not be loading time issue.

@Kevin_Z Hi man, same issue. Could you please send me the lastet beta firmware for TL-MR6400 v4? I have many disconnections per day with the current firmware. Thanks a lot