Nighthawk M1 speed degrades

Hi All,

I have rather interesting problem with MR1100-100EUS router (unlocked). I start to lose speed after some time and after router reboot speed returns to normal again (for some time). My normal speed is 200/60 and degraded speed is around 50/30. At the same time net speed on my phone is 200/60. Running latest fw 12.06.08. Configuration is default with no additional bands configured, running in Auto mode.

Getting 200/60 speed indicates that 2CA (carrier aggregation) is being used which my provider supports.

Any ideas?