2015 Subaru Legacy "Purges" transmission fluid, mechanic doesn't know why

[legacydriver96]

4 cylinder 2015 Subaru legacy, 122k miles, CVT transmission that has been serviced according to user manual
- There are no lights or warning indicators
- This issue occurs every year when temps drop below freezing (around December where I live)
- The issue manifests as the transmission "slipping" or "grabbing" when cold starting, also accompanied by the transmission fluid pump "screaming"
- The issue started happening after I had warranty transmission repair done under 100k miles, the dealership said it was the "valve body" (not immediately after, it occurred months later when temps dropped)
- I took it to the mechanic (2nd time for similar issue that occurred a little over a year ago)
- Mechanic says the transmission is "purging" fluid - the transmission is getting overheating and cooking off the fluid, has no idea idea
- Mechanic topped up the fluid and said to monitor the issue in case it returns

What would cause my transmission to overheat? From what I understand the transmission it cooled by a passive radiator.

 

[Raymond3006]

4 cylinder 2015 Subaru legacy, 122k miles, CVT transmission that has been serviced according to user manual
- There are no lights or warning indicators
- This issue occurs every year when temps drop below freezing (around December where I live)
- The issue manifests as the transmission "slipping" or "grabbing" when cold starting, also accompanied by the transmission fluid pump "screaming"
- The issue started happening after I had warranty transmission repair done under 100k miles, the dealership said it was the "valve body" (not immediately after, it occurred months later when temps dropped)
- I took it to the mechanic (2nd time for similar issue that occurred a little over a year ago)
- Mechanic says the transmission is "purging" fluid - the transmission is getting overheating and cooking off the fluid, has no idea idea
- Mechanic topped up the fluid and said to monitor the issue in case it returns

What would cause my transmission to overheat? From what I understand the transmission it cooled by a passive radiator.

"TOPPED-OFF" , means that they (you-?) never properly finished the Job of complete filling of the CVT !

The "screaming" sound probably is the CVT ALARM being set-off (it is on top of the CVT and will kill your hearing with VERY-LOUD , and VERY HIGH FREQUENCY SONIC ALARM Sound , especially if you lift the hood ; sometimes this is actually triggered by not having the Driver's door properly closed, while Engine is running , and putting vehicle into Gear ....

By Blenderizing the TWO DIFFERENT problems , they are just trying to cover THEIR BUTTS for crappy earlier work ... !