Can you tell me what I should try next?

OD light flashes, shifts hard like twice and then the SES light comes on. The OD light stops flashing. This is intermittant, as the SES light eventually goes out for a while, may be a day or two and the cycle begins again, although sometimes the flashing OD light and hard shift may happen a few times before the SES light goes out. Code P0720, replaced output shaft speed sensor and the turbo shaft output sensor. It happened again. What should I try next? I had the PCM replaced about a year ago.