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Resolution : Latest software upgrade
The QFX5120-48Y and -32C support Hardware-assisted Inline BFD that runs in the ASIC, but does not support authentication. If auth is used, it will revert to normal Inline BFD, which runs in the PFE software. If the PFE is busy, it will not keep up with BFD polling and your sessions will fail. Try to increase the time to a few seconds and work your way down to see when the problems start.
"QFX5110, QFX5120, QFX5200, and QFX5210 switches support 10 multihop inline BFD sessions. You can configure them with a timer of 150 x 3 milliseconds. Single-hop sessions are also supported."
The above is valid if the PFE is not very busy of course. Do you really need 3 x 300 ms or is, for example, 4 x 600 ms acceptable?