Android disconnect issues

[KV]

I am using HRM demo application on nRF52840 DK with Samsung Tab-A. The nRF Connect App is running on the tablet. We are seeing that the dev kit gets disconnected soon after a connection is established. The error code on peripheral side is 0x2A.

Android version is 7.0 Device model number SM-T580 Bluetooth version 4.2

This does not happen on iPhone 7 with the nRFConnect app.

Also, this does not happen on LG Nexus 5 smartphone running Bluetooth version 4.0.

[KV]

Thanks for the suggestion. This still did not fix the issue. I added the following lines of code which is executed once on power up (outside while(1) loop).

ble_stack_init();
peer_manager_init();
gap_params_init();
gatt_init();
advertising_data_set();

// initiliaze BLE parameters
gatt_mtu_set(ble_params.att_mtu);
data_len_ext_set(ble_params.data_len_ext_enabled);
conn_evt_len_ext_set(ble_params.conn_evt_len_ext_enabled);
preferred_phy_set(&ble_params.phys);

//st compatibility mode to 2 for samsung Tab-A disconnect issues
ret_code_t err_code;
ble_opt_t  opt;       
memset(&opt, 0x00, sizeof(opt));
opt.gap_opt.compat_mode_2.enable = 1;
err_code = sd_ble_opt_set(BLE_GAP_OPT_COMPAT_MODE_2 , &opt);
APP_ERROR_CHECK(err_code);

When I use the sd_ble_opt_get to read back the option (just to confirm) this soft device API returns error code 7 (invalid param). not sure what is wrong with this code below:

 memset(&opt, 0x00, sizeof(opt));
err_code = sd_ble_opt_get(BLE_GAP_OPT_COMPAT_MODE_2 , &opt);
APP_ERROR_CHECK(err_code);
NRF_LOG_INFO("compatiblity get:%d", opt.gap_opt.compat_mode_2.enable);

Also, I noticed that in the latest soft device v6 release notes that this issue has been fixed (DRGN-8623). Is that correct?