computer restarting every 5-7 days

5K 27" iMac Late 2015, kept up to date on everything. Thunderbolt monitor + a bunch of external drives.

Last year or so, my iMac has started rebooting for no apparent (to me) reason. I think mostly after update to the last OSX.

I don't have any specific programs running, no real drain on the system. I get up in the morning and I have to log in and the computer has had a kernal panic or something to that effect. This is happening about once a week.

Here is the first portion of what the report sent to Apple says:

panic(cpu 0 caller 0xffffff800bc757ea): "m_free: freeing an already freed mbuf"@/System/Volumes/Data/SWE/macOS/BuildRoots/2288acc43c/Library/Caches/com.apple.xbs/Sources/xnu/xnu-7195.101.2/bsd/kern/uipc_mbuf.c:4820

Backtrace (CPU 0), Frame : Return Address

0xffffffa11260ba70 : 0xffffff800b68e02d

0xffffffa11260bac0 : 0xffffff800b7d48e3

0xffffffa11260bb00 : 0xffffff800b7c4eda

0xffffffa11260bb50 : 0xffffff800b632a2f

0xffffffa11260bb70 : 0xffffff800b68d84d

0xffffffa11260bc90 : 0xffffff800b68db43

0xffffffa11260bd00 : 0xffffff800be9d68a

0xffffffa11260bd70 : 0xffffff800bc757ea

0xffffffa11260be00 : 0xffffff800dedc69f

0xffffffa11260be20 : 0xffffff800df128e8

0xffffffa11260be50 : 0xffffff800df04b4f

0xffffffa11260be80 : 0xffffff800b6d44b5

0xffffffa11260bef0 : 0xffffff800b6d5424

0xffffffa11260bfa0 : 0xffffff800b63213e

Kernel Extensions in backtrace:

com.apple.iokit.IONetworkingFamily(3.4)[EFF68ECC-483B-3BAC-82B9-09C8F0600009]@0xffffff800ded2000->0xffffff800dee8fff

com.apple.iokit.AppleBCM5701Ethernet(11.0)[FB91176C-5F80-3602-BE60-AC7C3BA3157B]@0xffffff800df00000->0xffffff800df23fff

dependency: com.apple.driver.mDNSOffloadUserClient(1.0.1b8)[B5B3AA31-2371-332B-82C7-ED3711EABDEF]@0xffffff800e159000->0xffffff800e15dfff

dependency: com.apple.iokit.IOACPIFamily(1.4)[0D13DDA8-F6FE-3649-A850-DE1D9BFF8CEF]@0xffffff800dc3a000->0xffffff800dc3bfff

dependency: com.apple.iokit.IONetworkingFamily(3.4)[EFF68ECC-483B-3BAC-82B9-09C8F0600009]@0xffffff800ded2000->0xffffff800dee8fff

dependency: com.apple.iokit.IOPCIFamily(2.9)[B99B3B05-71B8-3178-8C27-E0A0ACA9F16E]@0xffffff800e15f000->0xffffff800e187fff

dependency: com.apple.iokit.IOTimeSyncFamily(980.4)[A5FA159E-C468-37EB-92A2-A4B6E527C671]@0xffffff800e3ac000->0xffffff800e3c7fff

Process name corresponding to current thread: kernel_task

Mac OS version:

20E241

Kernel version:

Darwin Kernel Version 20.4.0: Thu Apr 22 21:46:47 PDT 2021; root:xnu-7195.101.2~1/RELEASE_X86_64

Kernel UUID: 068F99A3-1DB3-31C0-87D5-09942F122BB6

KernelCache slide: 0x000000000b400000

KernelCache base: 0xffffff800b600000

Kernel slide: 0x000000000b410000

Kernel text base: 0xffffff800b610000

__HIB text base: 0xffffff800b500000

System model name: iMac17,1 (Mac-B809C3757DA9BB8D)

System shutdown begun: NO

Panic diags file available: YES (0x0)

Hibernation exit count: 0

System uptime in nanoseconds: 22272881246837

Last Sleep: absolute base_tsc base_nano

Uptime : 0x00001441cf2cc527

Sleep : 0x0000000000000000 0x0000000000000000 0x0000000000000000

Wake : 0x0000000000000000 0x000000130c8b79e5 0x0000000000000000

last started kext at 28871866609: >!AActuatorDriver 4440.3 (addr 0xffffff800c7d1000, size 28672)

last stopped kext at 467933096471: >!AFIVRDriver 4.1.0 (addr 0xffffff7fa33b7000, size 8192)

loaded kexts:

>!ATopCaseHIDEventDrive

Any idea what might be causing this or what I might be able to do to help prevent this?

Thanks!