'PyFtdi Value Error 'No backend available' every now and then

I'm using pyftdi (https://eblot.github.io/pyftdi/) to handle a FTDI ft4232h. Everything usually works fine but every now and then I come across a ValueError saying 'No backend available'.

Is there any solution regarding that issue? I tried to copy the libusb-1.0.dll to C:\Windows32 as well as to C:\Windows\SysWOW64. I also tried reinstalling the ftdi driver with zadig as recommended.

Nothing worked so far.

NOTE: I'm bound to windows.



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