Transmission problem?

[Elysia]

I have a 2005 Outback, when the engine is cold it has difficulty shifting up (disengages the gear, RPMs go high, then shifts abruptly). But as soon as it warms up for 1-2 minutes, it shifts smoothly all day. What's going on?

[4Wheel]

Once your transmission is at operating temperature, check the fluid level.
Could also be a plugged screen.
A transmission oil change and filter replacement might be worth a try.
But check the oil level first.

[Elysia]

I checked the levels cold at at operating temp, they're fine. It had a recent fluid change. Think it may be the filter or screen?

[4Wheel]

Did it work before the fluid change?
Then may have messed it up or forgot to replace the screen?
If it started just after they worked on it focus there.

[Elysia]

I just bought it, and checked with the dealer and they changed the fluid and and filter. So I'm not sure if it did this before or not.