Table 8. Four topics and the words mined from our experiment data set.
| TOPIC 1 (t1) | TOPIC 2 (t2) | TOPIC 3 (t3) | TOPIC 4 (t4) |
| E71 | Music | Card | internet |
| Nokia | player | memory | wifi |
| E63 | firmware | phone | connect |
| work | update | PC | connection |
| phones | device | file | WLAN |
| cheaper | version | transfer | access |
| N97 | media | computer | home |
| E51 | latest | contacts | settings |
| 5730 | problem | folder | point |
| features | quality | suite | wireless |
| prefer | sound | bluetooth | laptop |
| LG | files | data | working |
| Phone | software | cable | password |
| Black | reason | copy | router |
| information | format | Wi | |
| flash | installed | ||
| refresh | USB | ||
| Songs |
My [Nokia E71]t 1 [music player]t 2 is not [working]t 4 properly even restored to factory [setting]t 4. How can I fix this [problem]t 4? After I install some added [features]t 1 on my [Nokia E71]t 1, it started not to [work]t 1 properly. Having it restored to default factory [settings]t 4, my [music player]t 2 is not [working]t 4 properly afterwards (was [working]t 4 before restoring). Please help me resolve this issue, it would be highly appreciated Thanks!