This looks like a hardware problem or a kernel bug so reassigning...

** Summary changed:

- bluetooth freezing after boot
+ BCM20702A bluetooth freezing after boot

** Package changed: bluez (Ubuntu) => linux (Ubuntu)

** Summary changed:

- BCM20702A bluetooth freezing after boot
+ BCM20702A bluetooth freezing for 4-9 seconds

** Summary changed:

- BCM20702A bluetooth freezing for 4-9 seconds
+ BCM20702A bluetooth mouse freezing for 4-9 seconds

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  BCM20702A bluetooth mouse freezing for 4-9 seconds

Status in linux package in Ubuntu:

Bug description:
  Boot system, the Bluetooth mouse will stop for about 4-9 seconds, then it 
will work as normal.
  I am using a plugable USB Bluetooth adapter for Bluetooth connections.
  I am using  blueman to connect.
  Mouse used is a Kensington Exper Mouse Wireless Trackball
  Issue does not occur with bluetooth speakers, or headphones.

  Computer- Dell Precision 5520.

  Logs show these errors as below

  bt_uhid_send: Invalid argument (22)

  Bluetooth: hci0: advertising data len corrected

  Description:  Ubuntu 20.04 LTS
  Release:      20.04

    Installed: 2.1.2-1
    Candidate: 2.1.2-1
    Version table:
   *** 2.1.2-1 500
          500 focal/universe amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: bluetooth (not installed)
  ProcVersionSignature: Ubuntu 5.4.0-40.44-generic 5.4.44
  Uname: Linux 5.4.0-40-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu27.3
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Jul  4 13:24:01 2020
  InstallationDate: Installed on 2020-06-03 (30 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  InterestingModules: rfcomm bnep btusb bluetooth
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 0c45:6713 Microdia Integrated_Webcam_HD
   Bus 001 Device 002: ID 0a5c:21e8 Broadcom Corp. BCM20702A0 Bluetooth 4.0
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. Precision 5520
  ProcKernelCmdLine: BOOT_IMAGE=/BOOT/ubuntu_ezfsem@/vmlinuz-5.4.0-40-generic 
root=ZFS=rpool/ROOT/ubuntu_ezfsem ro quiet splash pcie_aspm=off vt.handoff=1
  SourcePackage: bluez
  UpgradeStatus: No upgrade log present (probably fresh install) 05/22/2020
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.19.2 06X96V
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
dmi:bvnDellInc.:bvr1.19.2:bd05/22/2020:svnDellInc.:pnPrecision5520:pvr:rvnDellInc.:rn06X96V:rvrA00:cvnDellInc.:ct10:cvr: Precision Precision 5520
  dmi.product.sku: 07BF
  dmi.sys.vendor: Dell Inc.
   hci0:        Type: Primary  Bus: USB
        BD Address: 5C:F3:70:7E:32:2F  ACL MTU: 1021:8  SCO MTU: 64:1
        RX bytes:193521 acl:13666 sco:0 events:137 errors:0
        TX bytes:5858 acl:61 sco:0 commands:82 errors:0

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