Problem

that's more than likely damage from one leaf laying on top of another and sweating on it. lower the temp in your room a little, raise the RH a little, and cut back on your nutes a little.
 
people will tell you to spend a lot on a good ph meter, i've used the cheap ones forever, buy a bottle of 7.0 test solution, check it monthly, adjust if needed, good to go till it dies.
theres a lot of things you can use to raise or lower ph, but most of them seem to have problems. just stick with GH up and down, been doin a lot of people well for a long time.
 
the disease raised like this. Probably you guys can see more things. I checked the ph. And ita about 7.
 

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that really looks like one of two things to me, maybe both. large ph swings can cause patches like that, and root rot can cause patches like that.
you're checking the ph of the water you water with, after you add nutes to it (if you're adding any) and its 7.0?
thats not too bad for soil, a little high, i'd suggest a nice slow swing up and down between 6.5 and 7.0, centering around 6.8.
keep an eye on your new growth tips, and all your leaf edges. if those look ok, i'd say its some kind of ph problem. if they start to show damage, you might have root issues.
related to both, how often are you watering? are you letting your soil dry out good between waterings? are you using soil? hard to tell from your pics.
 
The new leaves firstly healthy but the end of the day start to produce vrown spots. I think it has a bigger chance to root rot. What should i do?
 
More pics
 

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if it is root problems, you can either use something like hydroguard, which is a microorganism that will out compete the pythium then die off, unless you keep applying it, or you can go sterile, with something like hydrogen peroxide. in soil i'd go with the hydroguard, and then i'd start making some aact and using it weekly to keep anything else from growing in your soil.
 
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