Sometimes PCB cannot be started

Quite often (7 out of 10 times) PCB doesn't start, or rather it tries to start - the PCB window opens very briefly and then disappears. The system log shows a segfault error, but there is nothing logged in the PCB log file. This happens whether I start pcb from the command line, the start menu, or click a pcb file in the file manager app. Once it fails to start, nothing works to get it going except a reboot. By nothing I mean I've tried closing down all other programs, init -q to restart systemd, etc.
I haven't been able to figure out exactly what causes this to happen (i.e. a conflict with another program or service or something like that). Once in a while there is no problem starting PCB up. The one constant is that if I reboot the system, PCB can then be started, but only if I start it shortly after the reboot. If I wait for an hour or more, it won't start. Clearly, something is occurring at some point on the system that causes the condition where PCB won't start. Once it's running, PCB usually stays running as long as I need it to. Occasionally it crashes, but not very often.

 An example of the segfault is:
Mar 27 14:17:46 localhost kernel: pcb[5277]: segfault at 60 ip 00007f173282d7d2 sp 00007fffe4fec290 error 4 in i915_dri.so[7f1732561000+51c000]

My system is a 2.5 Ghz Intel-based PC with a dual core processor and 2 Gb of RAM. It seems that I need to increase the RAM to 4 Gb (the max for this board), as the system is using swap space quite a bit these days. Could this low memory situation be causing my PCB issues?