I think its been bimonthly for 1 year now. There were signs that would happen for while though: they don't have enough staff. For months they added promo pages to convince new artists to join LO. They also made one publication with no new comics and only republished stories to save time, but... ultimately they had to switch to bi-monthly.
That being said, they launched a new digital magazine LOE which is released on the months LO isn't. So you can have ur monthly supply of loli.

>“Must be because the Loli boom is over”
Sadly but i think lolicon really isn't as popular as before, i blame the West
>“What happens is that the good artists publish themselves on the internet, in magazines only the bad artists are”
Thats true imo