Crossfeed?
(I'm 30 years non-current, so bin this if totally irrelevant)
Engines vs fuel
Way back in the distant past of 707s,747s etc,SOP was to feed tank-to-engine for T/O and APP, Crossfeed was only used for "non-critical" parts of the flight. Is this still so?
I'd feel far more likely to suspect some engine condition triggered by simultaneous throttle movement than the simultaneous problem condition occurring on both tanks (ice,water,whatever) on opposite sides of the wing.
Is it still tank-to-engine during approach these days?