F22 file browsers hanging

[Doug Wyatt]

New clean install ofF22, started under either gnome or kde.
Using konqueror and/or dolphin for file browsing.

My file browsers will hang for extended intervals, then will work fine
for a while, then hang again.  When hung, the window can be dragged
around the desktop, but nothing within the window responds to mouse
clicks.  I prefer konqueror but when it hangs (and all instances of
konqueror will eventually hang once one does) I've started a dolphin
window and that will work for a while then it also hangs.

My setup for F22 is pretty much identical to what I've been using for
F20 for some time.  Within F20 this has never happened, and in fact
I am forced to continue using F20 to get anything done.

I suspect samba since most of my storage is in a Win7 box, but when the
file browsers are hung, I can usually still access the win7 shares from
a cmdline. Filesystems shared from linux can be accessed from the Win7
box.

It doesn't seem to be a basic resource issue - cpu usage is low, real
memory is available and most of swap is unused, no disc activity is
apparent, other tools still work, such as gvim, system monitor,
hexchat and konsole windows.

Selinux is permissive and disabling firewalld does not help.  F22 is
up to date.

One other oddity I've noticed is that after initiating a restart from
F22 it will hang during the shutdown at some point for an indeterminate
period of time before continuing.  This never happens after initiating
a restart from F20.

any suggestions for troubleshooting?