VirtualBox clipboard issue AKA why doesn't this restart script work?

The host is Windows7, the guest is up-to-date Arch and everything I describe is for guest-to-host or host-to-guest copy and paste. The clipboard within the guest never fails. The VirtualBox Guest configuration has the clipboard set to 'bi-directional.'
I'm starting the clipboard via .xinitrc which includes the following line
VBoxClient-all &
This is what gets launched
oliver 211 1 0 15:33 ? 00:00:00 /usr/bin/VBoxClient --clipboard
It all works perfectly for an indiscriminate amount of time, then suddenly, it stops updating the buffer. If I try to copy/paste anything new, I get the last entry before it stopped working. If I restart it (by killing the process and running VBoxClient --clipboard) it works again for an indiscriminate time. Wash/rinse/repeat.
I wrote a quick script to run from cron but it's having problems
This is the script
#!/usr/bin/bash
PID="$(ps -ef|grep -i "[v]boxclient --clipboard" | awk '{print $2}')"
kill $PID && /usr/bin/VBoxClient --clipboard
exit 0
I watched the cronjob and it appears to be doing what I want but a 'ps' doesn't show it running afterwards
++ grep -i '[v]boxclient --clipboard'
++ awk '{print $2}'
++ ps -ef
+ PID=3158
+ kill 3158
+ /usr/bin/VBoxClient --clipboard
+ exit 0
I'm assuming cron runs the command in a shell that gets destroyed when the cronjob is done or something and this is tearing down the process. I've tried modifying the command with nohup and ampersands to no avail.
A fix for the underlying problem would be great but I'm assuming I'll be waiting on Oracle for that. In the meantime, if I could restart this thing periodically it would help me out a bit.
Any ideas?

I have the same problem - VBoxClient stops working and restarting it from cron does not work.
I run this from cron every 10 minutes:
(killall VBoxClient && VBoxClient-all) || VBoxClient-all
and VBoxClient is killed every time but is not launched again. How can you explain it?

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