Wrinkled leaves indicate dehydration. This can be because the orchid is loosing more moisture than it's able to draw up into it's roots. This can be from...
1. Underwatering (but see below, don't just increase watering without checking the roots).
2. Too small a root system to support the plant (possibly due to root rot).
Root rot is thought to be caused by lack of air flow. Lack of air flow can be caused by overwatering (which is why it's often thought that overwatering causes rot) or a medium which is too compacted/decayed.
Usually a plant will grow it's root system to match it's leaf growth, but if something has rotted the roots it might not be able to keep up. Also if it's suddenly gone a lot warmer (as it has here recently) that can cause them to dry quicker and need more water.
What I would do is check the roots. If the roots are firm, healthy and plenty of them then you problem is not root rot. If they are soft/mushy then they are bad and not absorbing water properly.
How often do you water? Do you have a set schedule or do you water when the plant seems to need it. If you have a set schedule try watering when the roots either change colour to silvery (in the bottom of the pot not just on top) or using a wooden skewer pushed into the medium to judge watering (pull it out and see if it feels damp, when it feels dry it's time to water).
This is of course assuming you have good roots. If they are bad then you need to pot into the smallest pot you can fit the roots in, then water in a similar way.
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That will help a lot of newbies 
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