Update package fails on Client part randomly

Hi Guys,

Once we build/deploy a full package for one of our pathcodes, Subsequent update packages work well usually but one fine day update package fails in client build part with below error in client build log.After that all update packages for that pathcode will fail with same issue in client part

Also we can see errors in import issues to local database in build machine's(fat client's) jde.log as pasted below

Now looking at the error in jde.log, I am interested in knowing

1) What could cause such an issue

2) Any quick fix to make updates successful again on current full package itself