Don't know if this is a clue:
Pages and pages when it happens.[332618.119964] hpet: Lost 7161 RTC interrupts
[332619.249713] hpet: Lost 7161 RTC interrupts
[332620.377823] hpet: Lost 7160 RTC interrupts
[332621.488050] hpet: Lost 7161 RTC interrupts
[332622.635306] hpet: Lost 7161 RTC interrupts
[332623.768783] hpet: Lost 7161 RTC interrupts
[332624.899920] hpet: Lost 7161 RTC interrupts
[332626.033064] hpet: Lost 7161 RTC interrupts
[332627.168708] hpet: Lost 7161 RTC interrupts
[332628.297503] hpet: Lost 7160 RTC interrupts
[332629.425464] hpet: Lost 7161 RTC interrupts
[332630.552225] hpet: Lost 7161 RTC interrupts
[332631.681454] hpet: Lost 7161 RTC interrupts
[332632.811269] hpet: Lost 7161 RTC interrupts
[332633.935842] hpet: Lost 7161 RTC interrupts
[332635.061693] hpet: Lost 7161 RTC interrupts
[332636.198401] hpet: Lost 7161 RTC interrupts
[332637.327734] hpet: Lost 7161 RTC interrupts
[332638.455454] hpet: Lost 7161 RTC interrupts
[332639.580462] hpet: Lost 7161 RTC interrupts
[332640.708072] hpet: Lost 7160 RTC interrupts
[332641.839916] hpet: Lost 7160 RTC interrupts
[332642.968147] hpet: Lost 7161 RTC interrupts
[332644.093201] hpet: Lost 7161 RTC interrupts
[332645.220317] hpet: Lost 7161 RTC interrupts
[332646.345499] hpet: Lost 7161 RTC interrupts
[332647.477100] hpet: Lost 7161 RTC interrupts
[332648.602670] hpet: Lost 7161 RTC interrupts
[332649.730262] hpet: Lost 7161 RTC interrupts
[332650.851066] hpet: Lost 7161 RTC interrupts