Question is why my client stopped importing blocks in the middle which appears to have happened to you. Space and Ram is not an issue and running on SSD.
I'm trying an import of the same bootstrap.dat from scratch. I'll let you know how it goes.
Here's how it started:
~/.clam$ sha256sum boot*
713b93b7458e88500f1e32557f0bc58b9f05a6b13e1de31576f25f5300184c96 bootstrap.dat
~/.clam$ ls -al
total 2504976
drwxrwxr-x 2 user user 4096 May 18 00:10 .
drwxr-xr-x 5 user user 4096 May 18 00:05 ..
-rw-rw-r-- 1 user user 2565076446 May 18 00:08 bootstrap.dat
-rw-rw-r-- 1 user user 148 May 18 00:09 clam.conf
~/.clam$ cat clam.conf
flushwallet=0
rpcuser=...
rpcpassword=...
keypool=1
upnp=0
server=1
daemon=1
irc=0
logtimestamps=1
port=45319
rpcport=45318
connect=0
~/.clam$ clamd
Clam server starting
~/.clam$ head -30 debug.log | grep Clam
2018-05-18 00:10:53 Clam version v1.4.17-139-gf0707d3 (2017-04-10 17:28:15 +0000)
~/.clam$ while :; do echo $(date) - $(tail debug.log | grep height= | tail -1); sleep 10; done
Fri May 18 00:11:41 UTC 2018 - 2018-05-18 00:11:41 SetBestChain: new best=000003b6025e531c9e165989bbbfd8a19be5ba2511a3d2d070498c1aa1136dd3 height=5717 trust=7401805469 blocktrust=1063958 date=05/16/14 11:09:36
Fri May 18 00:11:51 UTC 2018 - 2018-05-18 00:11:51 SetBestChain: new best=00000b2c5bbbc95cfbb045a8ca58e3820b07aa5dd5472461995addcb780590a2 height=6776 trust=8515692837 blocktrust=1048577 date=05/16/14 16:25:59
Fri May 18 00:12:01 UTC 2018 - 2018-05-18 00:12:01 SetBestChain: new best=000004730c32869e48fc4cd6dc1a99d7c3aae99fcbfa1037f682a6d8fe95ec35 height=8012 trust=9815316936 blocktrust=1048577 date=05/16/14 20:28:13
[...]
Fri May 18 01:36:23 UTC 2018 - 2018-05-18 01:36:23 SetBestChain: new best=f9243b101d293abc7099795aafd26fadffc708069fae803c9ec322ce63297754 height=293123 trust=6608808633831582027 blocktrust=152735179784970 date=01/12/15 19:51:44
Fri May 18 01:36:33 UTC 2018 - 2018-05-18 01:36:33 SetBestChain: new best=ebf8f79f2f8123797277110086d1a6c3446875787755633b61dbcbce9f92d1c5 height=293539 trust=6670194310946165725 blocktrust=157644268458826 date=01/13/15 02:52:16
Fri May 18 01:36:43 UTC 2018 - 2018-05-18 01:36:43 SetBestChain: new best=a1e6fc4fcfc1f384544617095a4405582e0c3bfc3328d5eca6217349acaba834 height=293958 trust=6728348153276871682 blocktrust=152354218550930 date=01/13/15 09:47:44
[...]
Fri May 18 10:45:27 UTC 2018 - 2018-05-18 10:45:27 SetBestChain: new best=47125008d327c11c4716e9df01ece7567fd3e12d5d9622bb34544ae6f7649bf2 height=1322104 trust=380221172138139629293 blocktrust=213286745834214 date=01/02/17 15:27:12
Fri May 18 10:45:37 UTC 2018 - 2018-05-18 10:45:37 SetBestChain: new best=83a65fd9b981138876b2a310da465b2ce9556fec651417f59bf204f0eb7004de height=1322299 trust=380267370908500849341 blocktrust=271563185633458 date=01/02/17 18:36:48
Fri May 18 10:45:47 UTC 2018 - 2018-05-18 10:45:47 SetBestChain: new best=8c3e5bbbe2d94f9448f328df91aefac9acb94dc410c32192118769c29fdcaae0 height=1322533 trust=380329215185451050218 blocktrust=246752776608651 date=01/02/17 22:34:24
What version of the CLAM client are you using? You'll see it in the debug.log. Mine is "Clam version v1.4.17-139-gf0707d3 (2017-04-10 17:28:15 +0000)".