Switches are the usual suspects. However, I always start with the basics. Is the hydraulic fluid full? Since the gear seems to work after trying it 2 or 3 times it might be low of fluid...because the pressure has to be build-up to complete the uplock sequence even after the limit switches have made contact. The other possibility is air in the system too, and since it is a "self bleeding" system after 2 or 3 cycles any air will "bled" out thus allowing pressure to build up on the 2nd or 3rd try.
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