We have very similar problem. First noticed this morning, it was fluctuating between 6 and 11 minutes, so assume it has to be Spin cycle. Did filter clean, self clean+. Run Quick Wash and now it is doing 16 and 19 minutes back and forth during Rinse. So stopped the washer, power it off, change cycle from Quick Wash to Rinse+Spin. Now new cycle is 19 minutes, came down to 7 minutes to Spin cycle and now back to 12 again, repeating the morning behavior between 7 and 12. Already called support line and submit my initial purchase receipt from last June and it is so strange literally used for little over a year and facing this problem. Also there is no error code in display whatsoever. Just run calibration and will post if behavior changes after calibration. Edit after 2 hours from Calibration, Run normal mode and during rinse it is going back and forth between 12 and 15 minutes mark and I had recorded 5 minutes of video as well if Samsung is inetrested in seeing it. Edit: 8/20/18. At this point it is 3+ weeks. First diagnosis that motor went wrong, cosnsumed more than a week, after replacting motor, washer went completely dead. Technician advised not to run washer and now it has to replace drum and whole nineyard parts. It took another 2 weeks for Samsung to approve and receive new parts. Expecting same repair company to repair in coming days. So this ordeal w/o washer for 3+ weeks is already taking toll. Will post about 2nd diagnosis and repair result.
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