Error only on the latest versions of PVE making bonding

Hello to all

I want to report that the latest versions of PVE have problem making bonding
And if anyone knows the answers I will be very grateful

The hardware:
- 2 Dell 2900 Servers
- NICs are broadcom
- 1 Switch Gb/s unmanaged

The Problem:
- If i use PVE 1.8 and do bonding balance-alb (or 6) works fine (I have it running since many years)
- If i use PVE 2.3 and do bonding balance-alb (or 6) works very bad, from power on, only some workstations can works with the VMs.
- All tested with the same hardware in production environment
- Always for PVE 2.x i have configurated disable multicast_snooping on bridge for avoid problems of PVE cluster communication

My questions:
1- What is the problem?
2- How fix it?

Best regards
Cesar