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I run a pair of these in mono config, also with remote sense cables and leave amps on all the time, have done so for years without problems. I have had a couple of repairs/upgrades over the years, sent both amps direct to Spectron -- is that where you went when you said a Spectron technician examined it? I would think if your system had the meltdown of a speaker, then I’d really worry about using this combination again but I’d want Spectron to look at the amp and confirm what the problem might be. It’s possible the problems lies elsewhere in your rig perhaps (which is what this ‘technician’ seems to be suggesting). Did Magnepan suggest what the problem might be?
Your story sounds a lot like mine. I dumped my third Spectron a few months ago in favor of a Rowland Continuum S2 to drive my Magnepan 3.7s.
This amp has been referred to in another thread as "Kryptobrand."
I started with a Musician II, used. It experienced issues over time, some of which included sparks and smoke. The right channel -- for whatever reasons -- has always been an issue in my amp and those of some others. Eventually, they convinced me to upgrade to the Hybrid. I got a year or two out of that before failures occurred, and it spent much time going to and from California.
They could never seem to articulate what the problems were...
Eventually I got weary of that, so upgraded to the MKIII se2 with all the bells and whistles. That worked for about two years before the right channel dropped out. After much diagnostic time and swapping of amp modules -- complicated by the fact that the problems were intermittent -- I sent it in, got it repaired, and decided I had had enough. Time to sell.
Also aiding my decision to sell is that all of the principles at Spectron passed away in the last year or two. John and Toni Ulrick are gone. Simon is gone. This leaves Manh the engineer holding the bag. Fortunately, I sold my relatively new Spectron to someone who is technical enough to deal with any issues that might come up, as he has worked closely with Spectron in the past. It found a good home.
I spent weeks testing various amps before settling on the Rowland integrated. It sounds great with the 3.7s. Also tried Bel Canto REF600M, Merrill Veritas, Sanders, and others.
My advice echoes others': Move along, and enjoy the process of finding your next amp.
Just to add to what @bostonbean was saying: I always found Spectron's service to be attentive, cordial, and effective. I never had any complaints about dealing with the folks at Spectron.
I did, however, get tired of amps failing and having the house go quiet for weeks while the amp was repaired and in transit.
Having been a guitar and hifi amp user since the 60s, I am extremely anti issue…meaning I fully expect everything I own to never break…ever. Sometimes stuff dies anyway, although rarely, but if an amp gets weird more than once in a couple of years it's banished immediately. Example: Had issues years ago with a Mondial Acurus A250 that buzzed in one channel to the dismay of Mondial who fixed it (seemingly) 3 times. Free. Third time back I sold it (cheap) with warnings to a friend and I think it worked for him. I am really impressed with ability of most gear to really last though, and melting Magnapans? Maybe the lesson there is to not leave amps on when you're not around…I realize many audio bozos feel that is bad bad bad…"gotta leave it on man…you just gotta!" No, you don't.