collision of notehead and stem

[ornello]

The following measure produces a collision of a stem with the half note in
voice 3:


\version "2.14.2"

{
\new Staff <<
\key c \major
\time 4/4
\clef violin
\new Voice {
\voiceOne
\once \override Stem #'direction = #up b'8\trill 
r8
\once \override Stem #'direction = #up cis''8.[  \(
\once \override Stem #'direction = #up bis'!32 (
\once \override Stem #'direction = #up cis''32]  ) \)
\once \override Stem #'direction = #up dis''8
r8
\once \override Stem #'direction = #up e''8.\trill [  \(
\once \override Stem #'direction = #up dis''32 (
\once \override Stem #'direction = #up e''32]  )
}
\new Voice {
\voiceTwo
\once \override Stem #'direction = #down < dis'
fis' > 8
s8
\once \override Stem #'direction = #down ais'!4
\once \override Stem #'direction = #down b'!8
s8
\once \override Stem #'direction = #down < fis'
cis'' > 4
}
\new Voice {
\voiceThree
s4
\once \override Stem #'direction = #down fis'2
s4
}
>>
}


Is this a known problem? Do I have to adjust the note position horizontally
or can the measure be notated in a way to avoid the collision?

Thanks for hints...
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