Hello Padmini,
I Just compared both the logs ( one you posted yesterday against the one which you posted just now) While comparing there is SID lock (in yesterday's log) which actually might be the reason ( or may not be ) .
So it is apparent that when ever there are locks, it is taking more than stipulated time. I suggest you to take up this matter with your BASIS team because there might be several malfunction with lock management . Please refer below document on lock management.It will help in some way in Improving the Issue.
About Lock Entries and Lock Table Overflow | SCN
Hope this helps !
Regards
YN