@Richard F I have a lot of site/pod failures the 2-3rd day. I have a bump a lot too, a bump after I take it off, sometimes red skin. I haven't connected them with the specific failures though. I honestly seem to have a problem with specific certain lots/boxes. I will have 2 in a row type of thing. But it is usually always the 2nd or even more likely the 3rd day. I am thinking the angle or the depth is just different enough it doesn't work as well. But I am reacting somehow. Skin, tunneling, poor absorption, scarring, just not sure.
Unfortunately some people have more issues with pumps. With tubed pumps you can change the inset used to steel or the depth can be changed. With an Omnipod you don't have that choice. But I have never wanted a tubed pump and now I swim for hours sometimes and really don't want a tubed pump. Not approved for that length of time in water, but the swimming doesn't seem to cause the issue.
You can call Omnipod and they have people that will call you back that specialize in helping you. They told me to try other areas like arms or legs. They also told me to use Skin Tac or an extra adhesive/tape to keep it more secure so it doesn't move and more likely to cause "tunneling". The other thing that can help stop tunneling is to keep insulin to smaller doses and wait a few minutes + in between doses.
In my case, my arms are saved for my Dexcom. I have spots on my legs that do work, but it varies a lot. And because I want my pods to still work for basal at least, I have taken to MDI for larger doses, I also use Afrezza. I keep my pod use to my basal and smaller dosing.
I'm not thrilled about it, but it is working most of the time. I don't feel I am as good at MDI as I have a tendency to round up. That's me though. If I have taken too many smaller doses I will still have a problem, but at least not until the 3rd day now.. You can call in the pods and they will replace them, but my script is also written generously for every 2 days so I don't have to worry about switching it out when needed. When I start to go higher than my "normal" or stay there longer. I just switch it out. I don't worry in my case whether I misjudged or there is another reason. I just switch it out really easily now because of my history with them.