I have had similar experience with faulty triggering on the Quad no matter what version of software.
If you look up the latest DSO NANO (1-channel) firmware update by BenF, that update user guide touches on what is wrong with the factory Nano and quite possibly the factory Quad triggering code. BenF fixed those problems in the DSO Nano updates and it is unfortunate that the Quad factory updates have failed to address this issue. The Quad triggering only works properly for the simplest of waveforms and the reasons are most likely similar to those described by BenF for the DSO Nano factory code.
Bottom line, the problem is not your problem alone, and it needs to be fixed in the triggering firmware.