It may just be timing out.
Drop down user name at top right of client (if you have many user names, you will need to scroll down to get to "Advanced")
Advanced > Preferences > Logout timeout
Change "Logout timeout" from 1776 to >9000!!!!
*this single change has allowed me to run the 0.9.1 Bitshares client (fairly certain it was 0.9.1 - I haven't fired up this laptop since April or May) with the following Frankenstein setup (although, not recommended for those with a productive schedule):
Dell Latitude D830
Windows 8.1 Pro - 32-bit
Intel Core 2 Duo T7300 @ 2.00GHz
2GB RAM
Seagate Momentus HDD @ 5400RPM - 120 GB - SATA 1.5Gb/s