Prevent stopping and heating in the middle of the print
Your allowable temperature tolerance might be too low.

You have seen what I call emergency-halt the print on getting too far away from the set print-temperature. As described, the allowable tolerance seems to be 1 degree, which means pretty much any variation in the printer head's temperature will trigger the stop before the software even can counteract it.

To counteract this, you might try to increase your allowable range slightly, for example to about 2.5 of more degrees, either way, giving the printer time to compensate without halting the print.

How the tolerance area works


Let's assume the printer has 210 degrees with a stable heat input from the cartridge and monitored by the thermosensor.
conditions are met to start printing.
Filament is pushed into the nozzle, picking up heat energy from the heater block.
The temperature of the heater block drops, as the thermal energy (=heat) input from the cartridge did not yet include the new thermal energy drain in the shape of the filament.
The Thermosensor registers the thermal drop a little bit later and notifies the chip
The chip increases the voltage on the heater cartridge with a little time difference


With a very low tolerance, it is possible to fall below the threshold before the cartridge could heat up to compensate

the cartridge pumps in way more heat than needed, raising the temperature rapidly back into the print-temperature tolerance area...
...and overshoots the aimed for 210 degrees.
The thermosensor only registers the aimed temperature with a short delay
the chip cuts the voltage to the heater cartridge lower
but there is still a lot of extra thermal energy banked in the heater cartridge, heating the block over the aimed 210 degrees


which again can trigger the stop for the temperature rose over the allowable tolerance.