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Check this forum for "flat" or "flat start", like the posting "flat run for pv plant".
Usually, oscillatory behavior during flat runtime contains entry on the table "INITIAL CONDITIONS SUSPECT" saved in a log file. Models' parameter with "DSTATE" values being nonzero would required review to eliminate the problem.

Compare network and dynamic data against a previous data set that did flat-started (same basecase from last year?). Check your basecase for units and dynamic devices outside their operating range (Vmax, Vmin, Pmin, Pmax, Qmin, Qmax). Check the runtime log file for switching or tripping activity. As test, consider gnet units with worst oscillations, one at a time.