Public bug reported:

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

blueman:
  Installed: 2.1.2-1
  Candidate: 2.1.2-1
  Version table:
 *** 2.1.2-1 500
        500 http://au.archive.ubuntu.com/ubuntu 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
Lsusb:
 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)
dmi.bios.date: 05/22/2020
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.19.2
dmi.board.name: 06X96V
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvr1.19.2:bd05/22/2020:svnDellInc.:pnPrecision5520:pvr:rvnDellInc.:rn06X96V:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: Precision
dmi.product.name: Precision 5520
dmi.product.sku: 07BF
dmi.sys.vendor: Dell Inc.
hciconfig:
 hci0:  Type: Primary  Bus: USB
        BD Address: 5C:F3:70:7E:32:2F  ACL MTU: 1021:8  SCO MTU: 64:1
        UP RUNNING PSCAN ISCAN 
        RX bytes:193521 acl:13666 sco:0 events:137 errors:0
        TX bytes:5858 acl:61 sco:0 commands:82 errors:0

** Affects: bluez (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

** Attachment added: "dmesg.txt"
   https://bugs.launchpad.net/bugs/1886245/+attachment/5389533/+files/dmesg.txt

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https://bugs.launchpad.net/bugs/1886245

Title:
  bluetooth freezing after boot

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