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The most likely cause of this issue is a faulty touchpad. I am including the tech sheet for this model in the images below. The diagnosis of this issue will require the use of an ohm/volt meter and you will have to perform ohm checks and/or live voltage checks. If you have an ohm/volt meter and are confident in your technical abilities, please utilize the checks below.
Always unplug or de-energize electrical equipment before removing covers or attempting service. Be careful and wear appropriate hand protection when working around sharp metal parts.
If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:
Sears Home Services
Here is a link that you may use to view the parts list diagram and for parts purchases;
Sears Parts Direct
I hope this is helpful. If I may be of further assistance as more details become available, please reply to this post.