I have a problem updating tumbleweed (now for 2-3 weeks):

After a few minutes of updating zypper as well as yast update stops for some time and resumes afterwards the updating again. In this way an update of 400 files takes a few hours.

The yast2log tells me

2020-09-26 00:14:27 <1> linux-5hsc.site(7666) [librpmDb] RpmDb.cc(doInstallPackage):1609 RpmDb::installPackage(/var/cache/zypp/packages/openSUSE_20190214-0/x86_64/libreoffice-draw-7.0.1.2-1.6.x86_64.rpm,0x0000000c) 2020-09-26 00:14:27 <1> linux-5hsc.site(7666) [zypp::exec++] ExternalProgram.cc(start_program):260 Executing[C] 'rpm' '--root' '/' '--dbpath' '/var/lib/rpm' '-U' '--percent' '--noglob' '--force' '--nodeps' '--' '/var/cache/zypp/packages/openSUSE_20190214-0/x86_64/libreoffice-draw-7.0.1.2-1.6.x86_64.rpm' 2020-09-26 00:14:27 <1> linux-5hsc.site(7666) [zypp::exec++] ExternalProgram.cc(start_program):444 pid 18530 launched 2020-09-26 00:14:34 <3> linux-5hsc.site(7666) [zypp] IOTools.cc(receiveUpto):97 select error: Interrupted system call 2020-09-26 00:14:34 <3> linux-5hsc.site(7666) [zypp] IOTools.cc(receiveUpto):97 select error: Interrupted system call 2020-09-26 00:14:34 <3> linux-5hsc.site(7666) [zypp] IOTools.cc(receiveUpto):97 select error: Interrupted system call 2020-09-26 00:14:34 <3> linux-5hsc.site(7666) [zypp] IOTools.cc(receiveUpto):97 select error: Interrupted system call 2020-09-26 00:14:34 <3> linux-5hsc.site(7666) [zypp] IOTools.cc(receiveUpto):97 select error: Interrupted system call 2020-09-26 00:14:34 <3> linux-5hsc.site(7666) [zypp] IOTools.cc(receiveUpto):97 select error: Interrupted system call

with the select error message repeating for a few hundred times before the update resumes.

What can I do, where to look for further information on the problem

Thanks for help