"x86 CPU CATERR" kernel panic once or twice a day at random (with or without user activity)

From about a year after purchase the kernel panics (then Mojave, always up to date; now Catalina, always up to date) started at irregular intervals, i.e. sometimes 4 times a day, sometimes 4 weeks no panics, lately 1 or twice a day. There is no (apparent) pattern, at least half of the time it happens over night or without any user activity (the machine does not go to sleep), but sometimes during user activity (irrespective of what software active).

I had it checked out for a month by an authorized Apple Service Point and they found NOTHING wrong, no panics! So they would not let me have new hardware under warranty.

Back in the office and clean install of Catalina it was ok for 3 weeks. Now it's once or twice a day at random hours.

It's comforting that it automatically reboots (which it did not under Mojave), so I guess I have to hope for a system update that fixes it.

Mac mini (2018), 3.2 GHz 6-Core Intel Core i7, 32 GB 2667 MHz DDR4, Intel UHD Graphics 630 1536 MB, Catalina 10.15.6 (19G2021)

Typical report:

panic(cpu 1 caller 0xfffffff02061ccec): x86 CPU CATERR detected

Debugger message: panic

Memory ID: 0xff

OS version: 17P6610

macOS version: 19G2021

Kernel version: Darwin Kernel Version 19.6.0: Thu Jun 18 20:30:46 PDT 2020; root:xnu-6153.145.1~1/RELEASE_ARM64_T8010

Kernel UUID: 828E8E47-4C82-3639-83B9-4F7DB86934F6

iBoot version: iBoot-5540.140.12

secure boot?: YES

x86 EFI Boot State: 0x16

x86 System State: 0x0

x86 Power State: 0x0

x86 Shutdown Cause: 0xc1

x86 Previous Power Transitions: 0x70707060400

PCIeUp link state: 0x1614

Paniclog version: 13

Kernel slide: 0x0000000018650000

Kernel text base: 0xfffffff01f654000

mach_absolute_time: 0x10ff18d05fa

Epoch Time: sec usec

Boot : 0x5f3bdba9 0x00074a89

Sleep : 0x00000000 0x00000000

Wake : 0x00000000 0x00000000

Calendar: 0x5f3c99bc 0x0006b908

Panicked task 0xffffffe0004ec200: 2315 pages, 158 threads: pid 0: kernel_task

Panicked thread: 0xffffffe0006b4000, backtrace: 0xffffffe0111fb4b0, tid: 338

lr: 0xfffffff01fea8860 fp: 0xffffffe0111fb4f0

lr: 0xfffffff01fea86bc fp: 0xffffffe0111fb560

lr: 0xfffffff01ffc3770 fp: 0xffffffe0111fb610

lr: 0xfffffff0204755d8 fp: 0xffffffe0111fb620

lr: 0xfffffff01fea8024 fp: 0xffffffe0111fb990

lr: 0xfffffff01fea837c fp: 0xffffffe0111fb9e0

lr: 0xfffffff020bf6974 fp: 0xffffffe0111fba00

lr: 0xfffffff02061ccec fp: 0xffffffe0111fba30

lr: 0xfffffff02060e11c fp: 0xffffffe0111fbaa0

lr: 0xfffffff020610044 fp: 0xffffffe0111fbb50

lr: 0xfffffff02060d854 fp: 0xffffffe0111fbbe0

lr: 0xfffffff0205d4cb8 fp: 0xffffffe0111fbc10

lr: 0xfffffff0203e2b14 fp: 0xffffffe0111fbc50

lr: 0xfffffff0203e2398 fp: 0xffffffe0111fbc90

lr: 0xfffffff020480514 fp: 0x0000000000000000