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DN5591 Needs Reset Every Few Days Due to Usatech card reader

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I have a dn5591 bottle drop machine with a USA tech card reader.  Every few days the machine locks up. It will not accept coins, bills or credit. The display says $3 credit but won't vend any selection. If I unplug the machine (reset it) the machine will work normally for several days but then have the same problem again. The card reader display says "disabled by vendor" when it is not working. How can I fix this problem?

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