Sometimes, quite often actually, the sub-forums/areas in certain places load either extremely slow or stop loading at all. However if you go directly to topic X of that sub forum (say the newest post there) it loads in flash. Same if you go to Portal or Home and try to go from there again. Those tricks never have issues.
It happens with posting/editing posts at times too, so when it seems certain from my end that it's not gonna post the message I'm writing and rather just gets stuck in endless loading cycle, I tend to just copypaste all I wrote, navigate my way back to thread (the way least causing me problems with load times) and just post it again. Usually it then posts immediately.
Any idea what could be causing this? Both on Firefox & Opera on PC, and Chrome on Android phone.