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Hi I have Unitronics Jazz Jz-20-T40 PLC. I have all the newest software and PLC system. When i power ON my PLC, and then using USB i connect it to my laptop, connection is working fine and i can see PLC from laptop. Then, when I download PLC Program to my Jazz PLC, it downloads normally, and as it should, PLC reboots. On my other Jazz PLCs it turns ON again, and it's still connected to my laptop. But, on this specific model, when i finish download, and try to connect to it again, it displays 4-5 messages that says restart U90, PC and so on. When I try to connect to it again, I get same message. I tried to restart U90, still the same. I really don't want to restart laptop, so I tried to unplug and plug USB. It shows me that i don't have needed drivers for this device. I click update device software, it says it's already newest, as it should. Then i try to install from U90, it says that I already have it. Then I unplug and plug again, and everything works normally. Every time I download, i need to unplug and plug USB twice, before I can again debug my PLC. It just needs to be reconnected twice, without installing anything at all. It confuses me a lot. Please help. Thankful in advance, Nikola Ljubinkovic