Connection drop immediately in specific Android models

Device/SW Info:

Ubuntu 18.1
SDK : 15.0
SD 132 v 6.0


The device once connected to the device is immediately dropping the connection upon going into discoverServices(), as seen in the logs. I am unable to understand the reason exactly. The same behaviour is seen in OnePlus 5, Vivo Nex Smartphones. Surprisingly, phones from same brand, OnePus 3 and OnePlus 6 don't exhibit this behaviour. Please suggest if something can be done to fix this

nRF Connect, 2019-03-16
TestDevice (FB:55:34:92:A5:46)
V	11:29:39.723	Connecting to FB:55:34:92:A5:46...
D	11:29:39.723	gatt = device.connectGatt(autoConnect = false, TRANSPORT_LE, preferred PHY = LE 1M)
D	11:30:05.422	[Callback] Connection state changed with status: 0 and new state: CONNECTED (2)
I	11:30:05.422	Connected to FB:55:34:92:A5:46
D	11:30:05.424	[Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED
V	11:30:05.452	Discovering services...
D	11:30:05.452	gatt.discoverServices()
D	11:30:05.452	[Callback] Connection state changed with status: 34 and new state: DISCONNECTED (0)
E	11:30:05.453	Error 34 (0x22): GATT CONN LMP TIMEOUT
I	11:30:05.453	Disconnected
D	11:30:05.461	[Broadcast] Action received: android.bluetooth.device.action.ACL_DISCONNECTED