what version of the sailfish firmware did it upgrade your printer to?
I have the Flashforge Creator Pro 2016 edition, mine currently runs v7.8 special heater edition, I do notice occasional temp drops and it plays a tone to let me know that the temp has returned to normal but it hasn't affected print quality. I print mostly with ABS, so I have also made changes to help keep drafts out of the build area to help keep the temperature stable,
Plugs to fill the spool holder holes
https://www.thingiverse.com/thing:1736683
part to block some of the hood opening and help with rattling
https://www.thingiverse.com/thing:1860297
the 2016 version has the left side hinge instead of the top edge hinge on the door, and the right side has a molded handle which leaves an opening I have yet to test ninja flex on the flashforge extruder so currently I put some masking tape over that hole.. I find that the sealed print volume really lowers the amount of times I hear the temperature notification,