Flowering, but losing leaves DAILY. help!

So im doing an outdoor grow. 5 gal pot. Im about 4 weeks into flower. No clue what strain she is. But she is losing leaves like CRAZY. they turn VERY pale yellow, then brown up and fall off. Should i be concerned? Or is this just the plant telling me its coming to an end? No clue if its a Photo or Auto. Currently feeding once a week with Fox Farms GROW BIG. Thinking its a lack of nitrogen, should i up the dosage? Or switch to Bloom nutes? This is my 4th yr and typically Ive gone all natural with no nutes. This year i decide to use nutes and have had more problems than ever before. PLEASE HELP!

Looks hungry

Definitely looks like it need more nitrogen

Some varieties need more nutrients than others. She looks a little bit hungry, but not bad, she'll be just fine. Maybe switch to a bloom nutrient that contains some nitrogen at this point. Some senescence/fade is okay.
Very hard to say from the picture, but she looks a little dry(?), could be wrong on that though.

Gotcha thanks for the tips! Planning to feed this evening. Im on the east coast and were dealing with some of that Corn Sweat currently. Like 95° today. After upper 70s last week ‍

How about this one...

I've never heard the term "Corn Sweat", is that hot weather at the end of summer?

How often do you water? Do you let them dry out between waterings? Overwatering sometimes looks similar to underwatering. If you pick up the pots between waterings are they heavy or light?

Is there any mold on the stem? It looks a little like stem rot or caterpillars. I don't deal with much mold or rot where I live, someone else might be better at diagnosing that. Hopefully, someone else will weigh in.

Lol yea they say the corn sweats which causes heat and humidity...

So i water about every 2-3 days. Yes letting them dry out (as far as i can tell) between waterings. Feeding once per week.

They seem light to me even after being watered. Lol.

Im gonna feed this evening. After i do im gonna lift them to get a good gauge on the weight, as ive had a few people mention lifting them to feel for dryness.

I was wondering about possible stem rot...i top dressed both plants back in early july...maybe too much top? With too much water?

It was also EXTREMELY dry and hot this yr, up until about 14 days ago. Then we got a BUNCH of rain and cool weather for a week...

Outdoor grow is so fun! Lol

When you get one stalk that keels over it's usually a borer grub. Look for a hole somewhere with sawdust and black droppings.

Ive been looking...cant find anything though...could it be below the soil?

Under the soil could be rot or infection.