We bought a new Qubit 4 under two years ago. We've gone through about 650 reactions in that time. Today, the unit failed to turn on. We tried connecting to a computer, using different plugs, etc. to no avail. ThermoFisher told us that the unit is not serviceable and we will need to purchase a brand new unit. Has anyone else run into this issue? Have others gotten a longer lifespan out of their units?