Could this be related to these 'irq's that run at idle:
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top - 12:58:16 up 3:13, 1 user, load average: 1.33, 1.32, 1.28
Tasks: 133 total, 1 running, 132 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.0 us, 0.8 sy, 0.0 ni, 98.2 id, 0.0 wa, 0.0 hi, 1.0 si, 0.0 st
MiB Mem : 923.2 total, 664.6 free, 49.9 used, 208.8 buff/cache
MiB Swap: 0.0 total, 0.0 free, 0.0 used. 802.2 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
84 root -51 0 0 0 0 S 12.5 0.0 26:37.82 irq/66-3f980000
87 root -51 0 0 0 0 S 12.2 0.0 27:49.07 irq/66-dwc2_hso
37 root 20 0 0 0 0 S 5.3 0.0 3:48.53 ksoftirqd/3
167 root -39 0 0 0 0 D 2.6 0.0 5:16.61 piControl I/O
3179 pi 20 0 10192 2824 2452 R 0.7 0.3 0:00.59 top
1 root 20 0 33684 7948 6380 S 0.0 0.8 0:05.61 systemd
2 root 20 0 0 0 0 S 0.0 0.0 0:00.02 kthreadd
3 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 rcu_gp
4 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 rcu_par_gp
8 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 mm_percpu_wq
9 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcu_tasks_kthre