I have problem in 5 week of flower

Burning from long term over feeding and/or a nutrient salt build up due to not getting sufficient run off each and every time you irrigate. No time to "fix" anything this close to harvest......."flushing" is just likely to make things worse. Reducing your feeds is about the only thing you can do, which you should be doing anyhow this close to maturity. It is not heat stress.

N excess and P,K lockout stop using fert with N at all

Looks like it burning from high feeds.

you don't have a diary on this plant but this can be several things as always with issues. Only you know if her grow and environment conditions are up to par. This appears to be heat stress to me. Look up heat stress on cannabis in flower in Google search, that's your plant. If her environment is where it should be and her soil is good this is a phosphorous deficiency. There's a great web page with good pics of later stage nutrient deficiencies. "11 common cannabis nutrient deficiencies". good luck

Your plant Is perfect Just give It a very good flush and It Will bouce back

Your EC is too high and your plant has nutrient burn. Lower the EC to 1.4 and the pH to 6.2 and monitor the development.