Crazy Stuff this DCC!

I hosted a client appreciation party at my house on St. Patrick's day and the railroad ran without a hitch.  Two weeks later, I turn it on and the DCS100 goes haywire!  Tried same for several days and same thing.  What's up with this.  This is the second time this has happened in a year.  The last time I sent it back to Digitrax for repair.  When asked what happened so I could avoid the same thing happening in the future, they "didn't know" why.  As a result, I just purchased a 2nd DCS100 for the RR so when one is down, at least I have a back up!  I had to do the same with a DT400 and now I have two of them.  Guess we need to have two DCC systems, one for the RR and one for the shop!