Yamaha G19 e not working when damp



I have a G19 Yamaha electric car. It sits in a shed with a dirt floor. A lot of moisture. The cart just clicks when I try to go. Batteries fully charged. Connection cleaned and sealed. Have to switch from tow to run several times for it to maybe go. After it is outside in the sun for awhile it will sometimes start to work well again. Any ideas on what might be causing the problem. Seems to be a moisture issue. But what? Anyone else have this problem?