It seems that prayer, per se, is not necessarily a good, thing, and in certain circumstances it could even be spiritually detrimental. This is clear from what our Lord says:
It seems that sometimes, prayer can be a kind of chore, as it were. Speaking personally, oftentimes prayer does not come out of a desire to confide my heart, and my mind, and my person within God, but rather as a task that needs to get done so that I can move on to "more important" things in my life. And it seems to me that if I can recognize this corruption of what prayer really is within my mind, then it would be better to simply not pray as I usually would, because to do so would be to reinforce this idea by my actions.But thou when thou shalt pray, enter into thy chamber, and having shut the door, pray to thy Father in secret: and thy Father who seeth in secret will repay thee. And when you are praying, speak not much, as the heathens. For they think that in their much speaking they may be heard. Be not you therefore like to them, for your Father knoweth what is needful for you, before you ask him
Matthew 6.6-8
It would seem to me that the heart of man can only be exhausted in prayer towards God so much. Insofar as prayer in to be sought in the movements of the passions towards God, in the emotional effect that it arises in man, it would seem that this capacity is limited within man, and thus, the act of prayer itself. And in this way, it would seem that there truly could be too much prayer.
It would seem that the problem in general is that man, always changing with the wind, is attempting to connect with God, who is unmovable, and never changes.