I've been stranded on this bike only twice in 11 years, both times due to electrical faults.
The first was back in 1994 due to a corroded battery connection, which I replaced with thicker-gauge wire; it's been fine since then.
The second was in 1999 & again in 2005 when my ignition fuse kept blowing, but only when I had a certain seat installed.
This year I finally traced it to a wiring harness that was being pinched between the bottom of that seat and a bolt on the rear fender, which had worn through the insulation on two wires, allowing them to short-circuit against the bolt when someone sat on the seat. I wrapped each of the exposed wires in electrical tape and re-routed the harness away from the bolt, and have not had a problem since then.
The fork seals tend to need replacement every 4-5 years or so.
The hydraulic lines for the clutch & front brake need to be bled about once a year; I believe Suzuki recommends replacing the fluid completely every 2 years.