Good to know man. Wat temps do u run them at? Do u check the heatsinks every week or so? Are they expected to loosen up later?
Do not open the machine during the warranty period!
I just shake machines gently when I first get them and listen for rattling, you need to make sure nothing came loose during shipping. The controller thing does rattle on top but that's normal.
Once the machine is running I try not to touch it. Monitor hash and temps. If you run them real hot I guess they could loosen up and drop off but temp would jump and machine would probably stop hashing. Then do the shake check again whenever you need to clean out the dust.
I live in cool dry climate and have 5 of them in garage so far. My ventilation is not ideal so I am looking to improve. But in winter I don't care because they heat my home.
There are 2 temps for the machine
#1 chip temps you can get from the machine web page, one for each hash board
#2 controller or chassis temp you can get from api stats command. I don't know where this temp sensor is so if someone knows then let me know. Its always lower than chip temps and it doesn't show on the web page. Awesome miner or the raw api output will tell you this temp.
My machines are running about 70 deg. Celsius chassis/controller and about 80-90 deg. Celsius chips. Not bad for a setup without proper ventilation. Many people run them hotter.