Starter problems of the 2013 Honda FIT

While driving the radio, dash lights, head lights, and power steering cuts out for a moment then comes back on. This started occasionally 3 months ago with just the radio and dash lights and has progressed to several times in a row and now includes the head lights and power steering. There is no predictability to when or how many times it will happen. Once it happened when I was coming off the highway going around the ramp at a good speed, the electrical went out I lost power steering and almost hit the guard rail it came back on just in time for me to regain control. Took it to Honda dealer with my complaints; they did a multi point inspection and checked faults-no faults stored. Also checked wiring and connectors-all ok. Told me it was probably the after market starter, I should be fine, to contact the starter people as it is most likely their product issue and not Honda's, then sent me home charging me over an hour of labor. A few days later it cut out 12 times in less than 3 mile; I had to find a gas station to pull over in as I did not feel safe driving the car. Turned it off & let it sit for a few minutes, started it again & had no further issues until the following day when it happened another 8 times in a row. Contacted the car starter company told them what was going on; they removed the starter. But told me he looked it up online & discovered this has happened to other Honda Fits & is most likely related to a faulty alternator. Another issue related with this alternator problem is dead batteries which has happened to me as well & am on my 3rd battery with in 6 years! the car starter guy said he was concerned with my safety & to have it looked at by my mechanic and have them look at the alternator. Well 2 days later the check engine light came on & is in the garage today; not the Honda dealership.