Work at the aggregated channels Etherchannel/LAG/LACP

Switching to bypass and back occurs link flapping. In that case, when all the links on one DPI platform some switches treate as lost of all connections and as a result LAG is rebuilded.
It is recommended to set delay between switching for switch links one by one:

bypass_link_delay=5

It helps avoid downtime during regular shutdowns and restarts DPI 1) at power failure or server failure bypass switch to happen anyway almost simultaneously

Keep in mind that when the connection between dpi and a switch dropped Only one link in the chain of the two kommutator1 ←link1→ dpi ←link2→ kommutator2 is brocken. This is detected for a long time under standard LACP settings (default is 30 seconds). For the fast detection of such disconnections should be used additional protocols - BFD, or tuning the LACP (fast switchover).