6. Thinking that we must solve problems ourselves first. Try not to let this problem happen often. But if it really happens, you may have to notify in advance. Or must you allocate your own time?
6. I think we must solve this problem ourselves. Try not to let this problem happen frequently, but if it does happen, we may need to notify in advance. Alternatively, we must set aside our own time.
6. I think we must solve the problem ourselves first, and try not to have this problem often, but if it does happen, it may need to be notified in advance or take our own time.