Time Capsule - Internet and Printer Fine - Disk Not Available

I have a 1 TB Time Capsule with an external drive and printer connected to it. Internet access works fine as does the printer. From time to time, I cannot connect to the Time Capsule disk or the external disk. I also cannot connect to the time capsule itself using the Airport Utility. If I unplug and restart the Time Capsule, everything is accessible and works fine. Then, a day or two later, I cannot connect.
Any ideas welcome!
Thanks... JRMjr


I have consistantly had this problem.
Time Machine could not complete the backup.
The backup disk could not be found.
Make sure the backup disk is connected or open the Time Machine preferences to select a different backup disk.
If I unplug it and plug it back in it will probably work, although I have had to totally start from scratch a couple times to get it working.
Is this a DHCP issue or how can I avoid this in the future?