If you do a search on IMU error, you'll find several posts about it. Here is just one:
http://www.phantompilots.com/threads/imu-error-recalibrate.41563/
Weird thing is it acted like normal once I reconnected to it after losing it. I think that straight line jump from the end of the arc is the drift it did after I lost signal. The end of that straight line is where I reconnected when I find it.
No IMU error is NOT normal.
The posts you've found (If the one you've linked to is anything to go by) are from people who don't even know what an IMU calibrations are or how to do it. I'd therefore ignore anything they say.
People putting phantoms in the fridge before calibration is so the calibration is effective from a colder temp. Meaning less delay when you turn it on as it only needs to warm up to a lower temp. It has nothing to do with any IMU error or a need to calibrate it more often than you should.There were many reports of IMU calibration errors for quite some time now. It's why people have been putting them in the fridge. I calibrated last week roughly 10 miles from here, so I don't think a compass calibration would be necessary.
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