Cisco WAN :: 877 - Improving DSL ATM Stability

We have several 877 routers across a few cities and experience infrequent 'drop-out's which are typically characterised by log entries like the example below.
 
Our biggest problem is that there is a 60-90 second hard-down period rather than just a 1-2 second 'blip' ... and TCP etc. don't cope well with an outage of this duration.
 
In general the SnR etc. on the links is good and these occurances are quite rare but when they happen it can be very alarming for users and transactions can fail.
 
configuration (prefereable acheivable at the CPE rather than the DSLAM end) to work:
 
1. reduce the outage duration... can the interface be instructed to be less sensitive to temporary line noise and just 'suck it up' rather than resynching?

2. improve the stability of the line... perhaps at the cost of a reduced speed?

3. improve logging of the root cause of the interface going 'down'?
 
%LINK-3-UPDOWN: Interface Virtual-Access2, changed state to down%DIALER-6-UNBIND: Interface Vi2 unbound from profile Di1%LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access2, changed state to down%LINK-3-UPDOWN:

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