It's totally normal for a system to lose hairs. The question is how much, how often, and is it overall or just in some areas?
Given the above, it depends on what is causing the hair to come out. It also depends on what kind of hair system you have?
You didn't say if you had lace or poly. If poly, how is. the hair attached... v-lopped or injected. Knotted lace should not significantly shed unless it is not cared for. V-looped and injected systems tend to shed, and don't last as long as knotted lace.
Provide some more information, and we can further guide you, not enough information to go on, now.