Problems with scanner Canon i-SENSYS MF229dw?

(The scan time of the same sheet varies from 28s. to 1:54)is Connected to 8 port switch

The wood was changed, FOR changed, Cable and ports also, the firmware on canon updated even wrote tech support canon there is a clear answer was not given (((
July 4th 19 at 23:04
1 answer
July 4th 19 at 23:06
What else on the switchboard? If there's a bunch of devices - all natural.
on the switch all ports are clogged, and error plavusa just on the General court made one thread it was) - deshaun.Hirthe commented on July 4th 19 at 23:09
: It was when the passive switch USB2.0 stuck two audio interface, two MIDI keyboard and DJ controller. Replaced the switch on USB 3.0 and stick it in a USB 3.0 port on the laptop. - orin.Runte commented on July 4th 19 at 23:12

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