HM-10 constantly looses connection with other СС2541-based device after 2-3 secs

I’m using HM-10 module to connect to Smart Bed which has its own BLE module which is also based on СС2541 (but not HM-10, and exact firmware is unknown). If I connect to that Smart Bed via BLE Viewer or any similar Android/iOS app, I get constant stream of status messages on FFE4 characteristic, the interval between messages is about 100 ms and there is no timeout.

However, when I do the same from my HM-10, it receives only first 10 to 15 messages (which takes about 2 seconds in average) and then reports OK+LOST and disconnects.

In order to test this I created BLE Server from ESP32 that emulates that smart bed (the same frequency of messages and the same messages) and made my HM-10 connect to my ESP32 thinking that it was smart bed. HM-10 receives those messages without any problem and without timeout.

So, there are three cases:

  1. iOS or Android connects to Smart Bed (СС2541) - receives all its messages without timeout
  2. HM-10 connects to Smart Bed emulator based on ESP32 - receives all its messages without timeout (same messages, same frequency!)
  3. HM-10 connects to real Smart Bed (СС2541) - receives only 10-15 messages, then timeout and OK+LOST

I initially tried this on v605 of HM-10. Upgraded to v705 - nothing changed.

So what is so special in communication between HM-10 and the other СС2541 that makes it constantly loose connection, while in all other cases neither HM-10 nor Smart Bed (СС2541) have any problems communicating with other devices under similar conditions?

Just in case, here is my connection sequence for HM-10:

(reset on power line)

AT
OK
AT+RENEW
OK+RENEW
AT+IMME1
OK+Set:1
AT+NOTI1
OK+Set:1
AT+UUID0xFFE4
OK+Set:0xFFE4
AT+CHAR0xFFE9
OK+Set:0xFFE9
AT+ROLE1
OK+Set:1
AT+CO04C249834B20E
OK+CO00A
OK+CONN

(a lot of status messages with 100 ms interval, for about 2 seconds)

OK+LOST

I’m stuck with that, would be thankful for any ideas…