I've had the problem incessantly for months since starting to use the service. The service randomly goes up and randomly goes down. While it is up far more than down, I've written about the problem before to no avail, and my writing has gone unanswered. It is a severe problem and an impediment to the product becoming one that is viable that will produce income from serious users who are business-people and professionals of all types who want a simple product to spoof their office phone number to call back clients from wherever they are calling.
It is completely embarrassing to have a call suddenly disconnect and an inability to reconnect for 20, sometimes 30 minutes or longer. The called party then tries to call you back on the spoofed number, to find out that you are not there -- or no one picks up. You then have to block caller ID to call the called party back, and they typically do not want to pick up, since they are trying to get you back on the line and do not know it is you calling. Until this frustrating, long-standing problem is fixed, the product has little value.