help!

Hey so I can't really find anything similar online or in my book, my leafs are twisting and drying put on the edges then later stage turning yellow/brown and getting dying spots. There are pictures I posted from first stage on. It is also starting from bottom to top of plant it seems. Any help will be appreciated.

Side note I have not used nut es in couple weeks due to I thought it was nute burn at first.

it looks like a nitrogen lockout,
Some basics? Room temps? Humidity? watering schedule? nutes?tap water or distiller/RO? Soil type?
Also do you test the ph of the water before you water her?

80 degrees, 50 percent humidity, watering about once a week, advanced nutes, distilled tap water, basic soil no added ferts. I tested ph of my water jug today and seen it's down to 5 ... that could it no?

Side note I have not used nut vs advanced nutes, which is it

I use advanced nutrients. Part a and b with b52. I have not used them in 2 weeks because at first the problem looked like note burn to me.

With adjusting the ph. How long should this take to straighten out?