when it rains, it pours
round
cycle
rhythm
frequent
occasional
episodic
casual
on an irregular basis
go-round
suddenism
sporadic
regular
flurry
throw into a cocked hat
wheel
break
interruption
streakedly
one thing led to another
semiperiodic
peril
race condition
streaklike
blizzard
periodic event
ptygmatic
quasiperiodic
accumulation point
streak
rash
asynchronous
recurrent event
crackling
it never rains but it pours
now and again
now and then
occasionally
chapter
once in a while
on occasion
from time to time
caprice
at times
misclock
irregularization
issue
outcome
glitch
effect
quasicycle
event
result
consequence
upshot
blunderfest
fluctuate
clusterability
on-again, off-again
bunchy
episodicity
spasmodic
eruption
outbreak
scattering
another nail in someone's coffin
heterochronic
incident
death by a thousand cuts
irruption
parasynchronous
fast-breaking
motion blur
gradualism
clusterlike
lippening
uncommonly
recurrence
rare
erratic
nonperiodic
periodical
aperiodic
humanitarian crisis
isochronal
quick
periodic
breakaway
recurring
randomity
sporadicalness
speckled
harmonic