Wifi QCA9377 disconnects when bluetooth is active and transmit, wifi under heavy load

[E T]

I have a laptop Dell Inspiron 5770 with wifi QCA9377 and bluetooth Qualcomm Atheros.

Some details:

# lsusb

Bus 001 Device 004: ID 0cf3:e009 Qualcomm Atheros Communications

# lshw -class network

  *-network

       description: Wireless interface
       product: QCA9377 802.11ac Wireless Network Adapter
       vendor: Qualcomm Atheros
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: wlan0
       version: 31
       serial: 5c:ea:1d:xx:xx:xx
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=ath10k_pci driverversion=4.19.0-17-amd64 firmware=WLAN.TF.2.1-00021-QCARMSWP-1 ip=192.168.0.2 latency=0 link=yes multicast=yes wireless=IEEE 802.11

       resources: irq:131 memory:d2000000-d21fffff

When wifi work alone without blueetooth I can stay connected also 20 hours without problem, but when bluetooth is active and transmit data with headphones, sometimes wifi disconnects, this happens also 3 or 4 times in 3 hours.

For intel wireless module and for ath9 I see parameter btcoexist, but this parameter doesn't exit for ath10k_pci or ath10k_core.

Is there a solution? If I need to open a bugreport, I'm unable to determine which package my bug report should be filed against, could you help me?

Thank you

Giovanni