Here are common long distance relationship problems couples face and need to deal with to continue making their relationship work:
1. Drifting Apart
It's easy to feel like you are both growing apart, but this is usually a gradual process, where you realize one day you've drifted apart or are starting to.
2. Nothing to Talk About
Nothing to talk about can be related to the drifting apart problem but not necessarily. You may feel awkward about where you fit into your partner's life now that they live and work somewhere where you aren't.
3. Wanting a Reply or Answer NOW
4. Misunderstandings
5. Infidelity
6. Time Zones
Check this article for more details about problems and solutions in LDR.