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u, v, and tc do not seem to have this issue, which makes me think that it is not an actual misfunctioning of the acoustic part of this instrument.  It is non-orthogonal, so any path problem would show up on a horizontal velocity in addition to the vertical.  We should call this to the attention of whomever owns it.

A data example, unparsed from the sensor:

2017 05 19 00:00:43.6530 0.04999      44 M:x =   392 y =    65 z =    87 t =  1154\r\n

2017 05 19 00:00:43.7030    0.05      44 M:x =   364 y =    57 z =    94 t =  1176\r\n

2017 05 19 00:00:43.7531 0.05008      44 M:x =   339 y =   -33 z = 13593 t =  1169\r\n

2017 05 19 00:00:43.8030 0.04991      44 M:x =   359 y =    55 z =    32 t =  1161\r\n

2017 05 19 00:00:43.8525 0.04949      44 M:x =   387 y =    68 z =    26 t =  1151\r\n

Clearly, the bad value of 13593 came straight from the sonic.