Do you think the issues you're having are hardware or software? With the exception of the sim tray, obviously. Have you tried the cyanogenmod nightlies? I've been running them on my OPO for ages and frankly I've got no complaints, no desire to upgrade to anything else. It's running fine.
I think it's more likely hardware, I have read some comments etc online and it's actually not an uncommon issue. Oneplus official response (yeah right) is a dead battery. But in my case, I don't have to charge the phone up again before it'd turn back on, it's a simple case of plugging it in...
I'd recommend trying the cm12.1 nightlies before completely giving up on it, although it's not sounding like you're having a great time with it... Unless you're already on them?
Do you think the issues you're having are hardware or software? With the exception of the sim tray, obviously. Have you tried the cyanogenmod nightlies? I've been running them on my OPO for ages and frankly I've got no complaints, no desire to upgrade to anything else. It's running fine.