Program closes after some time

[formtapez]

While contesting, not1mm closes itself after roughly 1-2 hours.
When restarted, it closes again after that time.
I'm connected to a cluster, if that matters.

Invoked from a shell, i get this errors, when that happens:

(process:28214): GLib-ERROR **: 17:09:09.788: Creating pipes for GWakeup: Too many open files
(process:28214): GLib-ERROR **: 17:09:09.788: Creating pipes for GWakeup: Too many open files
(process:28214): GLib-ERROR **: 17:09:09.788: Creating pipes for GWakeup: Too many open files
(process:28214): GLib-ERROR **: 17:09:09.788: Creating pipes for GWakeup: Too many open files
fish: Job 1, 'not1mm' terminated by signal SIGTRAP (Trace or breakpoint trap)