Gstr1 quarterly filling option opted but from yesterday it changed

I registered my gst on august 2018 and opted for quarterly filling of gstr1, I filed my first gstr1 on September and after that my gstr1 option shows disabled on October filling time, before 2-3 days I checked and now gstr1 option shows in enabled condition.

Now my October month gstr1 and November month gstr1 shows enabled but last week the option was in disabled condition .