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should be below 80 degrees at all times afaik.
If it's the case, then improve airflow within you case
Use interactive or hotplug governor - it keeps the SoC cooler.
I have the same problem. I had not time to investigate, but it seems that instead of CPU freq throttling cores are being shut down to keep the SoC safe from overheating. I also noticed, that once a core is down it will not go up (at least not within a few minutes after the temp is back to 'normal')
Anyway - I've attached a small fan to one box and it did great job at keeping it cool. In another box I used a trick - I've turned the whole case to vertical position long side. It improved the airflow inside significantly.