kippei, over-watering is the most common cause of decline in corn plants indoors. The few roots are at the base of the canes and are susceptible to root rot; therefore one has to know how wet the soil is, at the bottom of the pot. The best way to know this is to probe the soil at the bottom of the pot before watering. A thin wooden or metal rod will do nicely. Probes made for this specific purpose have little notches to trap bits of soil which can be rolled betweeb thumb and forefinger for moisture content.

Thank youfor your reply!
I'm very confident that I am not over or underwatering the flower. I live in a very humid country and there has been no need to water the plan yet as the soil is still moist 2 inches down. I believe it was the location in the apartment that made him a little bit sad, now I've put the plant in the bedroom by the window where it has indirect sunligt for more than 6 hours a day. I realize that a plant just like us get scratches and that I should panic too much if I notice a small brown spot on a leaf.
It has grown a lot already and has baby leaf coming out of various places on the trunk and it keeps shooting out new bundles of leaf out the top of the main branches so I think he is doing fine now.
I've also given him som fertilizing.

Thank you!

kippei, at the risk of being a nuisance, I have to ask, "Where does the water go?" If it remains in the saucer or decorative container then it is essential that the excess water should be discarded and the whole rootball dry out completely before the next watering. The trick is to apply just enough water so that there is no excess.
I would advise against repotting. If you find it necessary, go up in very small steps. The more soil there is, the greater the water holding capacity and more chance of root rot.
Assuming a 12-inch depth of rootball, a 10-inch diameter container with an existing plant has a total volume of just over 942 cubic inches (soil and roots).
1728 cubic inches = 1 cu. ft.
Upgrading to a 12-inch diameter container adds about 416 cubic inches of soil ONLY (which will hold additional moisture) until enough roots grow in and displace some of it.
It is that added moisture which can lead to root rot.
Be very miserly in fertilizing. Indoors, there is no rainfall which will leach (or wash away) fertilizer products. Often there is not enough light for the plant to use the fertilizer rapidly. As a result the products remain in the rootball and can cause leaf scorching.
Oh! One other thing; rotate the plant (anti)clockwise a quarter circle every so often so that it leafs out evenly in all directions.
Hope this all helps.