If that's what is happening, it could be a solenoid going bad, the actual torque converter clutch material wearing out, or the seals for the torque converter clutch piston getting worn & letting the fluid leak past them. Most likely the seals. that would let the piston apply pressure to the clutch,engage, bleed a little, disengage, & so on. It may have also worn the clutch material for the lockup.
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