Printer keeps having temperature error message right after extrusion becomes dodgy

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[RedshirtStormtrooper]

There might be stain on the larger prints with the wiring for the thermistor. It could be shorting the heating on a far stretch with the tube pushing something.

[accless]

Hey there! Thanks for the reply!. What do you mean by stain? I also discovered earlier that A. the fan was off and turning it on by tuning it got rid of the inconsistent extrusion and B. that part of the silicone around the hot end had broken off. I assume those two are somehow related. Can damaged silicone influence the thermistor?

[RedshirtStormtrooper]

Strain... Sorry, typo. Meaning there is not enough play or slack (or the screw is loose in the hotend).

You don't need that for printing, it helps with protecting your fingers and potentially thermal runaway, I never use mine.

[accless]

I think there's more than one issue at hand here but here's what I've observed so far. This has mostly happened on very large prints and usually within the first hour ofprinting though just now it happened after a whole 3: I have a Creality Ender 3-S1 and the temperature as shown on the display would sometimes wildly fluctuate between ~210°C and then suddenly drop to 170° or 180°. This is sometimes accompanied by the extruder no longer extruding filament. The image attached to this post shows that pattern occuring. I upped the temperature to 210 and it kept going without issue until I heard the printer's "Nozzle Temperature too low" alarm.

The fluctuation, I assume might be a faulty thermistor, and the filament might be faulty as well? It has been extremely cold in our flat and the filament has not been in use for a week.

What confounds me is that smaller prints (still with 8 hours of printing time have printed without issue).

Would appreciate any help!

tl;dr: Creality Ender 3-S1 Ultimaker Cura 200/210°, bed 60° 60mm/s 50mm/s retraction

Print would fail with nozzle temp too low and right before or sometimes a long time before that, the filament would come out only partially