We had this issue with our 2018 Miramar 35.3. I noticed there was plastic around the opening for the deadbolt in the frame that was catching the deadbolt. We had a really hard time locking the deadbolt and unlocking it and our door would also stick. I removed it and we no longer have any issues.
Hope this helps.
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Frank & Kathy
2018 Thor Miramar 35.3
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