SOLVED my issue: Got An issue when LACP from FG to MS.  the PO (spanned across X1-x2) in the FG side has 5 subinterfaces and the meraki side has an aggregate interface and it was configured with VLAN 1-1000.   This configuration caused all the subints in the FG to be down (red).  When I modified the MS side in the aggregate interface to have only the VLANs required, like 10,20,30,40,50 and deleted the 1-1000, the Ints at the FG went up and have been steady ok for a while.   in other words, the Vlans numbers in the MS  should match the sub ints in the FG. ... View more