Intermittent A/C

[lsupcar]

My a/c will sometimes work normally, but othertimes will experience a one to fifteen minutes delay, in which time, while on auto, no a/c'ed air will be blown, and then, when it starts working and blowing cold air, it might cut out for another minute or two before coming on again like normal.
I have searched and found others complaining of these symptoms, but no one has posted a cause that led to a resolution.
I've recently had a new compressor and drier installed and will likely take it back to the shop to be seen to again, as this was a problem that has been occuring for a year or so and the repair was only about two weeks ago, but I don't have time right now to bring it back in.
If someone has a solution to this problem I would appreciate the help.
Thanks.
Bill Z