B5- Lite RX/TX Rate drops

When running Traffic Split 25/75 @ 2ms my TX and RX rates drop randomly for 1min or so
Drops down to 102 / 68

1min later is backup 102 /341

Mikrotik Traffic

I get no packet loss when this happens … I have tested with 40mhz and 80mhz
Different Rate Adaptation Criteria and PHY Rates
TDMA Window 2ms and 4ms

When running Traffic Split @ auto i do not have this problem but do get very little packet loss . 25/75 2ms there is no packet loss but RX/TX drops randomly
Running version 1.4.1

Drop down do 1.3.1 - will be OK.

i still had some packet loss running version 1.3.1