Perhaps due to the network instability, we have not received. vs Maybe due to the network instability, we have not received.

Some examples from the web:

• Unfortunately, we have not received any institutional reply to this question so far.
• Unfortunately, we have not received any positive signs regarding this from the intergovernmental conference.
• Nevertheless, we have not received any response to date.
• A few months ago, President Prodi, we proposed the launch of a Climate Stability Pact, but I am afraid that we have not received any response.
• To date, we have not received a clear indication from our partners that would confirm a repeat of the 2005 events.
• I mean, we have not received one usable idea so far.
• Ladies and gentlemen, we have not received notification today of this decision of the Polish Government, which, I might add, is highly questionable.
• However, as of today, we have not received any response, which demonstrates the Commissioner's inability to react to a situation that would have deserved immediate action.
• Mr President, ladies and gentlemen, we have not received definite or satisfactory answers from the new Commission concerning the fight against illegal immigration within the European Union.
• We have not received your registration fee.
• And we have not received payment.
• So far we have not received any reply.
• We have not received word from you, Ilithyia.
• We have not received word from you, Ilithyia.
• We cannot understand them because we have not received the relevant education.
• Madam President, if what you say is true, we have been particularly unfortunate because, although we requested these environmental assessments, we have not received a reply insofar as we have only been told that this is confidential information.
• The deadline by which it had to answer the Commission's questions expired on 6 December 1999 and we have not received a reply.
• We have not received any invitation by the queen which is customary to our rank.
• We have not received the funding we asked for: it is regrettable but true.
• We have not received any invitation by the queen... which is customary to our rank.

Some examples from the web:

• Unfortunately, we have not received any institutional reply to this question so far.
• Unfortunately, we have not received any positive signs regarding this from the intergovernmental conference.
• Nevertheless, we have not received any response to date.
• A few months ago, President Prodi, we proposed the launch of a Climate Stability Pact, but I am afraid that we have not received any response.
• To date, we have not received a clear indication from our partners that would confirm a repeat of the 2005 events.
• I mean, we have not received one usable idea so far.
• Ladies and gentlemen, we have not received notification today of this decision of the Polish Government, which, I might add, is highly questionable.
• However, as of today, we have not received any response, which demonstrates the Commissioner's inability to react to a situation that would have deserved immediate action.
• Mr President, ladies and gentlemen, we have not received definite or satisfactory answers from the new Commission concerning the fight against illegal immigration within the European Union.
• We have not received your registration fee.
• And we have not received payment.
• So far we have not received any reply.
• We have not received word from you, Ilithyia.
• We have not received word from you, Ilithyia.
• We cannot understand them because we have not received the relevant education.
• Madam President, if what you say is true, we have been particularly unfortunate because, although we requested these environmental assessments, we have not received a reply insofar as we have only been told that this is confidential information.
• The deadline by which it had to answer the Commission's questions expired on 6 December 1999 and we have not received a reply.
• We have not received any invitation by the queen which is customary to our rank.
• We have not received the funding we asked for: it is regrettable but true.
• We have not received any invitation by the queen... which is customary to our rank.