problem with modems not answereing

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we have a peoblem with some of the modems not answering. here is a snip
from the log file.

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07/25 10:57:21 yC0  mgetty: experimental test release 1.1.16-Jul05
07/25 10:57:21 yC0  check for lockfiles
07/25 10:57:21 yC0  locking the line
07/25 10:57:22 yC0  WARNING: DSR is off - modem turned off or bad cable?
07/25 10:57:22 yC0  lowering DTR to reset Modem
07/25 10:57:22 yC0  WARNING: obsolete setserial spd_hi/spd_vhi used, 38400
is not real port speed
07/25 10:57:22 yC0  send: AT&F&H1&R2&B1S0=0&K1&M4&S1S2=43[0d]
07/25 10:57:22 yC0  waiting for ``OK'' ** found **
07/25 10:57:23 yC0  waiting...
07/25 11:57:23 yC0  checking if modem is still alive
07/25 11:57:23 yC0  mdm_send: 'AT'
07/25 11:57:33 yC0  Warning: got alarm signal!
07/25 11:57:33 yC0  mdm_read_byte: read returned -1: Interrupted system
call
07/25 11:57:33 yC0  mdm_get_line: cannot read byte, return: Interrupted
system call -> ERROR
07/25 11:57:33 yC0  mdm_send: 'AT'
07/25 11:57:43 yC0  Warning: got alarm signal!
07/25 11:57:43 yC0  mdm_read_byte: read returned -1: Interrupted system
call
07/25 11:57:43 yC0  mdm_get_line: cannot read byte, return: Interrupted
system call -> ERROR
07/25 11:57:43 yC0  modem on dev=ttyC0 doesn't react!: Interrupted system
call
--
07/25 11:57:44 yC0  mgetty: experimental test release 1.1.16-Jul05
07/25 11:57:44 yC0  check for lockfiles
07/25 11:57:44 yC0  locking the line
07/25 11:57:44 yC0  lowering DTR to reset Modem
07/25 11:57:45 yC0  WARNING: obsolete setserial spd_hi/spd_vhi used, 38400
is not real port speed
07/25 11:57:45 yC0  send: AT&F&H1&R2&B1S0=0&K1&M4&S1S2=43[0d]
07/25 11:57:45 yC0  waiting for ``OK'' ** found **
07/25 11:57:46 yC0  waiting...
07/25 12:10:05 yC0  wfr: waiting for ``RING''
07/25 12:10:05 yC0  send: ATA[0d]
07/25 12:10:05 yC0  waiting for ``CONNECT'' ** found **
07/25 12:10:16 yC0  send:
07/25 12:10:16 yC0  waiting for ``_'' ** found **

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We are using USR 33.6 Sportster modems with a Cyclades board and linux
kernel 2.0.29


The modems answere some time and other times not. we have replaced modems
and cables so that is sort of ruled out.

any ideas???

thanks