It may be the door open button or the door button lever. Sometimes grease is the culprit, other times the surfaces where these two meet get worn, making the door harder to open.
You can find the full service manual free at our site here.
You can find Sharp part at the
Sears Parts Direct
Web site here
or
Encompass here.
You can find links to helpful exploded view diagrams and part ordering help for other brands here.
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Sounds like an intermittent door switch or a loose door switch mount. Very common.
At our site, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information.
See our listing here on FixYa: http://tinyurl.com/yzjozk
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