Beginning of the End? Another Automatic Transmission 3GTL

2005 Acura TL 5AT, starting to slip gears while accelerating (power in and out very quickly). Does this once every 5 to 10 minutes. Happens mostly in 3rd gear, also in 4th.

Is this the beginning of the end?

Here's some history:

155k miles
Purchased used at 70k miles - mostly highway
Maintenance completed
71k - Amsoil D4 1 x 3
80k - Amsoil D4 1 x 3
90k - Amsoil D4 1 x 3
120k - Amsoil D4 1 x 3 , 3rd and 4th pressure switch (i honestly felt no difference when changing the switches).

Dipstick still looking mostly 90% rose, 10% brownish
Any advice? I've started looking for transmission shops in LA/OC. If anyone can advise anything, I am all ears.