question plextalk/book port plus

[Sunshine]

has anyone experienced theis problem when either using an external 
microphone/ microphone headset combo/internal microphone where when 
recording there is great amounts of static/crackle?
my plextalk pocket is on the 6.0 firmware and the book port plus is on 
the 4.2 firmware both units exibit this behavior if this has happened to 
you could you let me know how to fix this if there is a way to fix it?

thanks.