Anyone experiencing "weird" calls?

[heatersenke]

We have had MJ for 3-6 months now and for the most part are fine with it. However, in the past two weeks, we have received calls at very odd times, just before 5 in the morning and just before 1 in the morning. The "weird" part about it is that the caller ID is completely blank, no message was left, VERY few people have our number since it switched (all of whom denied calling) and when it happened this morning, I answered the phone and it was basically dead, like there wasn't really a connection nor a dial tone. Of course it could be legitimate calls, but if it were, why absolutely no information in the SoftPhone window for the call? So I thought I would put it out there to see if there is possibly anyone else using MJ that perhaps has experienced this sort of thing.