Steering is Tight and then breaks loose on 2001 Toyota Sequoia

Just had rack & pinion replaced in fall. Shortly thereafer had to replace component in steering wheel that controls horn and airbag (told it was screwed down too right when R&P replaced- broken clock spring?). Then had VSC light come on at some point during this mess- told it was angle arm sensor. Was having problems steering when car first started - like no power steering until I would be turning hard, and then it would break loose and be fine. I was told angle arm sensor would cure this but it has not. This is getting discouraging. Any ideas?

Asked by for the 2001 Toyota Sequoia
Aftermarket reman power steering rack and pinions are suspect, have not had much luck with these or power steering pumps as of late. Need to recheck with shop that installed rack.