Can you elaborate on the problem(s)? I've had one for over a year now and no issues other than somewhat shorter battery life than I'd hoped when diving fully rigged.
I received my P2 on November 12th, 2016. At first, I loved it and used it on every dive. On December 30th, I lent it to a friend who was teaching a DPV course. I am not sure exactly what happened, but it had a battery fire. I think there was a crack in one of the o-rings, which then failed and flooded the DPV. Either way, I can not fault Dive Xtras for this initial problem. We gutted the battery and sent everything else back to Dive Xtras to see if they could salvage any of it. They were helpful and covered some of the repairs under warranty. My portion of the bill came to about $2200. The DPV was returned on March 30th, 2017. So, for the first five months that I owned my Piranha, I was able to use it for 6 weeks. Again, I don’t know what happened, so I am not blaming Dive Xtras for this. However, after paying $2200 for the repair I think they are responsible for the subsequent problems.
On May 29th, it died while I was diving. Luckily, I was near the boat. The propeller was turning slowly, but not enough to provide any useful propulsion. I contacted Dive Xtra by email and was told to mail it back for repair. Since I live in Hawaii and the batteries are hazardous material, it took me a while to figure out how to ship them back. The DPV reached the factory on June 16th. They determined that it was the belt drive. Dive Xtras replaced the belt drive under warranty and shipped it back to me on June 21st. I was frustrated that I had a second issue, but happy with the prompt turn around.
On September 10th, it died again. It appeared to be the same problem. This time I found what looked like small pieces of rubber inside the DPV. Despite my email sent on 10 September, and a few other emails, I did not hear back from Dive Xtras until I reached someone by phone on September 18th. After receiving a repair authorization number, I again shipped it back. They received it on September This time the entire motor assembly was replaced. The installed an entirely new motor, electronics, belt, heat-sink, mounting plate, and motor pulley, again under warranty. It was returned to me on September 22nd. Although I was very frustrated at this point, especially about it taking over a week to get any response to my email, I was impressed with the quick turnaround.
On November 11th, it died for the fourth time. Someone must have been watching out for me because it died within 10 feet of the mooring line at the end of a great dive. This time, Dive Xtras responded quickly to my email. (Unfortunately, we are getting to know each other fairly well.) The DPV arrived at the factory on November 17th, where it is now.
I am glad that your experience has been positive. I like the DPV, when it works.