convertible top issue

[MrBen]

I had a new top installed with the glass window in my 2002 s. Shortly after I got it back the top would not go up or down completely. The installer says it worked when I picked it up. It did once or twice. I have found that it will go up or down if you leave it sit for a few hours. It will cycle about 25% then stop. Go back and try later another 25% Eventually it will complete the cycle. My thought is the new top is stiffer and the old motor just does not have the power to complete the cycle. The switches all seem to work. The windows go down, parking brake works etc. I have it down now so I can drive it. I just can't raise it without several try's over along period of time. Anyone experience this, any advise.