It looks like it's not getting enough water. Make sure the soil is fast draining and water according to whether the soil is getting dry and not on a schedule of 2 or whatever weeks. There are too many variables for plants and schedules don't work. Also, if you're fertilising and not giving it enough water then you'll end up with excess salts in the soil which which cause more problems. They like a good flushing with water in a soil that drains fast.

Agreed, its thirsty- and yes to the "pot flush" as well- pour enough water (slowly) that about half the volume of the pot worth of water drains out the bottom- flushing the salts/waste out. Do this once a month (some do it weekly but if you're using a typical potting soil it could get too soggy doing it that often)

How much light does it get? Depending on the amount of light, they can use up water kinda fast. Stick a wooden chopstick in deep (even your fingers) and see how the soil is down in there- cool and moist is nice, not soggy or powdery dry.

Keep us posted how its doing, monsteras are worth it!

I say more light, more water. These plants are tropical climbers, so as stated above they need to be flushed (like the rain would do in nature). Try watering when the soil is alllllmost dry--use the chopstick method elevensixty mentioned. They also can handle direct sunlight if it's filtered or dappled.

Where are you located? Mine just came out of a long dormancy period, I had it on a chilly windowsill and cut back watering to about every 2 or 3 weeks. Then when I moved it under a grow light and increased water and temperature it put out 4 new leaves at a time (I have several in one pot).

I don't know what kind of soil you have it in but it may be too dense.....which will cause root rot. The mix should be "fluffy" and fast draining.......you can mix potting mix with extra perlite and some orchid mix to make a nice "open" type soil. I bet if you unpot it there will be very little healthy roots. Cut off the dark/black roots and repot it in fresh soil.