T58W Pro - Bluetooth Pairing Issue - BTH58 handsets

[JED]

Hi
Did anyone solve this Bluetooth issue?

We are having 2 pcs. SIP-T58W PRO, which loses the Bluetooth Handset sporadic. When we lose the connection, there isn't any Bluetooth Connection in the Menu.
The phone´s is using FW: 150.86.0.38 (Phone system is 3CX)
The Phone is registered to the Phone system, it is only the Handset that loses the BT Connection. If they restart the Phone, the BT Headset is mostly connected again, until a few days later. The handset is always near the phone.

Thanks in advance