PPCL550 autoconnect() cycles between success and failure

Every other call to autoconnect() seems to fail. 

```
from pyrolab.api import locate_ns, Proxy

NAMESERVER = "secretserver"
LASER = "secretlaser"
FPGA = "secretfpga"

ns = locate_ns(NAMESERVER)
laser = Proxy(ns.lookup(LASER))
laser.autoconnect()
```