Yeah, good point.
140w is what I hit in the ‘off’ portions of 40/20s when I really feel like 
Some better data, Did a test on a segment where I have two other efforts from Jul 2020 in Strava.
Segment stats:
1.92Miles, 342ft vertical, 3.3% average gradient
12 JUL 20:
170.2lbs, 10:51 time, Avg Speed: 10.6mph, AvgHR: 167bpm, PM Avg P: 225W (FTP: 230W)
26 JUL 20:
169.6lbs, 10:38 time, Avg Speed: 10.8mph, AvgHR: 159W, PM Avg P: 194W (FTP: 230W)
Today:
168.8lbs, 8:41 time, Avg Speed: 13.3mph, AvgHR: 175bpm, PM Avg P: 170W (Trainer Road FTP: 141W)
Using the calculator that @Ivanecky provided at: Climbing Power Calculation for that segment (20lb bike weight):
12 JUL 20 Calculated P: 187W (-38W from the recorded data)
26 JUL 20 Calculated P: 192W (+2W from the recorded data)
Today Calculated P: 256W (+86W from the recorded data)
Now I ran a bunch of other Strava segments from 2020 through the calculator and in general the calculator was pretty accurate on straight steep climbs; segments with gradient variability threw it off. On my 12 JUL 20 ride above, I had two large power spikes like sprints so I think that made the Average P high.
So… it appears confirmed that the power meter is off. I’ll probably do the manual calibration and go to the doctor. I went all out today and am guessing the power meter is off 60+W. L/R leg balance was in normal range, but am not sure if both pedals are not working or just one.
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I don’t know anything about the Garmin Vector’s, but there’s a whole thread about issues with them here: Garmin Vector 3 - Dropouts/Right sensor missing - #97 by Nickm123
To be honest, you’d know if you were ill to a degree that drops your performance massively. You’d feel tired and struggle with other things in life.
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That is looking pretty conclusive. Once you get to the bottom of the issues with the power meter you will probably find your FTP is actually 350W! 
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This would be super funny.
He has his busting his ass thinking his ftp was dripping when in fact was growing!
I hope is that!
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