Lower branch wilted / brown spots at main node

strain: og kush
soil: fox farm ocean forest
nutrients: metrop
ph: 7
light source: sun
current temps: 80-85 degrees
humidity: 30-50%

So I watered my plants about a gallon and a half of plain water last night and they were fine this morning. By 12pm, one of the lower branches had all its leaves wilting with the top of the branch hanging to its side (picture 1). I suspect it could be over-watering but I'm using the 35 liter botanicare hercules pots, (with air holes all over) so over-watering has never really been an issue for me.

I also noticed that there is some browning at the bottom of the plant's main stalk, which is typically normal (see pics). But there are also similar brown spots on the nodes of random branches at the middle and bottom of the plant. (as seen on the 3rd node up in the pic) Could this be related to a possible root problem? I've seen some dead roots at the top of the soil when it fully dries out...

Thoughts/suggestions appreciated! Thanks.

Those brown spots on the stalk aren't an issue but the wilted out branch doesn't look right. Not an overwatered look. Broken stem?

is the branch broken ? dog run up under it? nothin serious i think

Most of the branch is very firm now, except for the tops (leaves still flopping like in the pic). I don't think the stems broke but they might have gone under a lot of trauma. Pinkjackyle might be right. I think the dog might have been the culprit, I've seen the little bitch walk around the plants lol

I hope they bounce back... its been a few days and they still look the same